Bài 4: Toán tử và biểu thức, hàm toán học trong Java

**thaihoang12345** · 10-31-2013, 07:00 AM

em xin nộp bài :d
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Mã:

import java.util.scanner;
public class bt1 {
    public static void main(string[] args)  {
        scanner input = new scanner(system.in);
        system.out.print("nhap so sinh vien: ");
        int n = input.nextint();
        input.nextline();
        string[] danhsachsv = new string[n];
        system.out.println("**nhap ten cac sinh vien**");
        for (int i=0; i<n; i++) {
            system.out.print("sinh vien " + (i+1) + ": ");
            danhsachsv[i] = input.nextline();
        }
        for (int i=0; i<n; i++) {
            for (int j=(i+1); j<n; j++) {
                if (danhsachsv[i].compareto(danhsachsv[j]) > 0) {
                    string phu = danhsachsv[i];
                    danhsachsv[i] = danhsachsv[j];
                    danhsachsv[j] = phu;
                }
            }
        }
        system.out.print("nhap ten sinh vien can tim so thu tu: ");
        string timsv = input.nextline();
        int phu = 0;
        for (int i=0; i<n; i++) {
                if (danhsachsv[i].equals(timsv)) {
                    system.out.println("so thu tu cua " + timsv + " la " + (i+1));
                    phu = 1;
                    break;
            }
        }
        if (phu == 0) {
            system.out.println("khong co ten " + timsv + " trong danh sach.");
        }
    }
}

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**chootohanoi** · 11-02-2013, 07:00 AM

mọi người xem hộ với, tự mầy mò học đó
bài 1:

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Mã nguồn PHP:


[color=#000000]
package javaapplication[/color][color=#007700];public class [/color][color=#0000bb]baitap1 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {      [/color][color=#0000bb]int a [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700], [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]6[/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]=[/color][color=#0000bb]7[/color][color=#007700];      [/color][color=#0000bb]int a1[/color][color=#007700], [/color][color=#0000bb]b1[/color][color=#007700], [/color][color=#0000bb]c1[/color][color=#007700];      [/color][color=#0000bb]a1[/color][color=#007700]= [/color][color=#0000bb]a [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700];      [/color][color=#0000bb]b1[/color][color=#007700]= [/color][color=#0000bb]b [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700];      [/color][color=#0000bb]c1[/color][color=#007700]= [/color][color=#0000bb]c [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700];    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần nguyên của a là: "[/color][color=#007700]+[/color][color=#0000bb]a1[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần nguyên của b là: "[/color][color=#007700]+[/color][color=#0000bb]b1[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần nguyên của c là: "[/color][color=#007700]+[/color][color=#0000bb]c1[/color][color=#007700]);      [/color][color=#0000bb]a1[/color][color=#007700]= [/color][color=#0000bb]a [/color][color=#007700]% [/color][color=#0000bb]3[/color][color=#007700];      [/color][color=#0000bb]b1[/color][color=#007700]= [/color][color=#0000bb]b [/color][color=#007700]% [/color][color=#0000bb]3[/color][color=#007700];      [/color][color=#0000bb]c1[/color][color=#007700]= [/color][color=#0000bb]c [/color][color=#007700]% [/color][color=#0000bb]3[/color][color=#007700];    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần dư của a là: "[/color][color=#007700]+[/color][color=#0000bb]a1[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần dư của b là: "[/color][color=#007700]+[/color][color=#0000bb]b1[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phần dư của c là: "[/color][color=#007700]+[/color][color=#0000bb]c1[/color][color=#007700]);      [/color][color=#0000bb]a[/color][color=#007700]++;      [/color][color=#0000bb]b[/color][color=#007700]++;      [/color][color=#0000bb]c[/color][color=#007700]++;    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giá trị của a là: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giá trị của b là: "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giá trị của c là: "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);             }}[/color]

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bài 2:

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Mã nguồn PHP:


[color=#000000]
package javaapplication[/color][color=#007700];public class [/color][color=#0000bb]baitap2 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {    [/color][color=#0000bb]float a[/color][color=#007700]=[/color][color=#0000bb]3.5f[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]4.3f[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]5.2f[/color][color=#007700], [/color][color=#0000bb]x[/color][color=#007700]=[/color][color=#0000bb]0f[/color][color=#007700];    [/color][color=#0000bb]int x[/color][color=#007700];      [/color][color=#0000bb]x [/color][color=#007700]= ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x="[/color][color=#007700]+[/color][color=#0000bb]x[/color][color=#007700]);        [/color][color=#0000bb]x [/color][color=#007700]= (int) [/color][color=#0000bb]x[/color][color=#007700];    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x="[/color][color=#007700]+[/color][color=#0000bb]x[/color][color=#007700]);    }}[/color]

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bài 3:

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Mã nguồn PHP:


[color=#000000]
package javaapplication[/color][color=#007700];public class [/color][color=#0000bb]baitap3 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]float a[/color][color=#007700]=[/color][color=#0000bb]3[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]4[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]5[/color][color=#007700], [/color][color=#0000bb]p[/color][color=#007700], [/color][color=#0000bb]s[/color][color=#007700];        [/color][color=#0000bb]float a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]p[/color][color=#007700]= ([/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]s[/color][color=#007700]= (float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p[/color][color=#007700]*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]a[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"diện tích tam giác là: "[/color][color=#007700]+[/color][color=#0000bb]s[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700]= (float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700](([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]s[/color][color=#007700])/([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]b[/color][color=#007700]= (float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700](([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]s[/color][color=#007700])/([/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]));        [/color][color=#0000bb]c[/color][color=#007700]= (float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700](([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]s[/color][color=#007700])/([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"các gốc của tam giác lần lượt là: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#dd0000]", "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#dd0000]", "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);         }}[/color]

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**lythuha92** · 11-09-2013, 07:00 AM

bai 1:

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap1 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {       [/color][color=#0000bb]int a [/color][color=#007700]= [/color][color=#0000bb]57[/color][color=#007700];        [/color][color=#0000bb]int b [/color][color=#007700]= [/color][color=#0000bb]34[/color][color=#007700];        [/color][color=#0000bb]int c [/color][color=#007700]= [/color][color=#0000bb]83[/color][color=#007700];                [/color][color=#ff8000]//in phan nguyen khi chia cho 2        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" phan nguyen (" [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]"/2) la " [/color][color=#007700]+ ( [/color][color=#0000bb]a [/color][color=#007700]/ [/color][color=#0000bb]2 [/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" phan nguyen (" [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]"/2) la " [/color][color=#007700]+ ( [/color][color=#0000bb]b [/color][color=#007700]/ [/color][color=#0000bb]2 [/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" phan nguyen (" [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]"/2) la " [/color][color=#007700]+ ( [/color][color=#0000bb]c [/color][color=#007700]/ [/color][color=#0000bb]2 [/color][color=#007700]) + [/color][color=#dd0000]'
'[/color][color=#007700]);                [/color][color=#ff8000]//in phan du khi chia cho 3                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" phan du ( " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]"/3 ) la " [/color][color=#007700]+ ( [/color][color=#0000bb]a [/color][color=#007700]% [/color][color=#0000bb]3 [/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" phan du ( " [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]"/3 ) la " [/color][color=#007700]+ ( [/color][color=#0000bb]b [/color][color=#007700]% [/color][color=#0000bb]3 [/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" phan du ( " [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]"/3 ) la " [/color][color=#007700]+ ( [/color][color=#0000bb]c [/color][color=#007700]% [/color][color=#0000bb]3 [/color][color=#007700]) + [/color][color=#dd0000]'
' [/color][color=#007700]);                [/color][color=#ff8000]//        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" sau khi tang len 1" [/color][color=#007700]+ [/color][color=#dd0000]", gia tri cua " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" la " [/color][color=#007700]+ [/color][color=#0000bb]a[/color][color=#007700]++ );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" sau khi tang len 1" [/color][color=#007700]+ [/color][color=#dd0000]", gia tri cua " [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]" la " [/color][color=#007700]+ [/color][color=#0000bb]b[/color][color=#007700]++ );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]" sau khi tang len 1" [/color][color=#007700]+ [/color][color=#dd0000]", gia tri cua " [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]" la " [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]++ + [/color][color=#dd0000]'
' [/color][color=#007700]);       } }[/color]

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bai 2

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap2 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// todo auto-generated method stub        [/color][color=#0000bb]float a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];               [/color][color=#0000bb]a [/color][color=#007700]=  [/color][color=#0000bb]0f[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]=  [/color][color=#0000bb]8f[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]=  [/color][color=#0000bb]2f[/color][color=#007700];               if([/color][color=#0000bb]a [/color][color=#007700]== [/color][color=#0000bb]0[/color][color=#007700])        {            if([/color][color=#0000bb]b [/color][color=#007700]== [/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])            {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phuong trinh co vo so nghiem x"[/color][color=#007700]);                [/color][color=#0000bb]system[/color][color=#007700].exit([/color][color=#0000bb]0[/color][color=#007700]);            }            else            {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phuong trinh khong co nghiem x"[/color][color=#007700]);                [/color][color=#0000bb]system[/color][color=#007700].exit([/color][color=#0000bb]0[/color][color=#007700]);            }        }        else        {            [/color][color=#0000bb]float x [/color][color=#007700]= ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) / ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]a[/color][color=#007700]);            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nghiem thuc cua phuong trinh, x = " [/color][color=#007700]+ [/color][color=#0000bb]x[/color][color=#007700]);            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nghiem nguyen cua phuong trinh x = " [/color][color=#007700]+ (int) [/color][color=#0000bb]x[/color][color=#007700]);        }    }}[/color]

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bai 3

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap3 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// todo auto-generated method stub        [/color][color=#0000bb]double a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];[/color][color=#ff8000]// a, b, c la 3 canh cua tam giac.        [/color][color=#0000bb]double p[/color][color=#007700];[/color][color=#ff8000]// soherong        [/color][color=#0000bb]double dientich[/color][color=#007700];[/color][color=#ff8000]//s tam giac        [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]5d[/color][color=#007700]; [/color][color=#ff8000]//ab=5cm        [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]5d[/color][color=#007700]; [/color][color=#ff8000]//bc=5cm        [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]5d[/color][color=#007700]; [/color][color=#ff8000]//ca=5cm               //tinh dien tich tam giac.               [/color][color=#0000bb]p [/color][color=#007700]= ([/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]) / [/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]dientich [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p [/color][color=#007700]* ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]a [/color][color=#007700]) * ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) * ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]c[/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"dien tich tam giac abc la: " [/color][color=#007700]+ [/color][color=#0000bb]dientich [/color][color=#007700]+ [/color][color=#dd0000]'
'[/color][color=#007700]);               [/color][color=#ff8000]//tinh so do goc a        [/color][color=#0000bb]double sina [/color][color=#007700]= ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]dientich[/color][color=#007700]) / ([/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]);[/color][color=#ff8000]// 2s/(ab x ac)        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"goca = " [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sina[/color][color=#007700]) + [/color][color=#dd0000]" rad"[/color][color=#007700]);               [/color][color=#ff8000]//tinh so do goc b        [/color][color=#0000bb]double sinb [/color][color=#007700]= ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]dientich[/color][color=#007700]) / ([/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]b[/color][color=#007700]);[/color][color=#ff8000]// 2s/(ab x bc)        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gocb = " [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sinb[/color][color=#007700]) + [/color][color=#dd0000]" rad"[/color][color=#007700]);               [/color][color=#ff8000]//tinh so do goc c               [/color][color=#0000bb]double sinc [/color][color=#007700]= ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]dientich[/color][color=#007700]) / ([/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]);[/color][color=#ff8000]// 2s/(bc x ca );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"gocc = " [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sinc[/color][color=#007700]) + [/color][color=#dd0000]" rad"[/color][color=#007700]);                  } } [/color]

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**chinh92** · 11-15-2013, 07:00 AM

Gửi bởi sky6596

bài 1 :

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap001 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int a[/color][color=#007700]=[/color][color=#0000bb]5[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]8[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]15[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen khi chia a, b, c cho 2 lan luot la : "[/color][color=#007700]+([/color][color=#0000bb]a[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]) + [/color][color=#dd0000]", " [/color][color=#007700]+([/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]) + [/color][color=#dd0000]", " [/color][color=#007700]+ ([/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du khi chia a, b, c cho 3 lan luot la : "[/color][color=#007700]+([/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]) + [/color][color=#dd0000]", " [/color][color=#007700]+([/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]) + [/color][color=#dd0000]", " [/color][color=#007700]+ ([/color][color=#0000bb]c[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]) );        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"sau khi tang 1 don vi : a= " [/color][color=#007700]+ (++[/color][color=#0000bb]a[/color][color=#007700]) + [/color][color=#dd0000]" b = " [/color][color=#007700]+ (++[/color][color=#0000bb]b[/color][color=#007700]) + [/color][color=#dd0000]" c = " [/color][color=#007700]+ (++[/color][color=#0000bb]c[/color][color=#007700]));    }}[/color]

</blockquote></div>
</div>
</div>

chấm điểm: 10 điểm!

bài 2:

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap002 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]float a [/color][color=#007700]= [/color][color=#0000bb]5.2f[/color][color=#007700],  [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]6.4f[/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]9.8f[/color][color=#007700], [/color][color=#0000bb]x[/color][color=#007700];        [/color][color=#0000bb]x [/color][color=#007700]= ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"x can tim : " [/color][color=#007700]+ [/color][color=#0000bb]x[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"sau khi ep kieu x = " [/color][color=#007700]+ (int)[/color][color=#0000bb]x[/color][color=#007700]);    } }[/color]

</blockquote></div>
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</div>

chấm điểm:

thiếu ở chỗ: khi người dùng nhập a = 0 ,

chương trình của bạn sẽ bị lỗi!

nhưng do bài này chưa

học tới if nên cho bạn 9 điểm nhé!

bài 3 :

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]baitap003 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {         [/color][color=#0000bb]double a [/color][color=#007700]= [/color][color=#0000bb]3.2[/color][color=#007700], [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]2[/color][color=#007700], [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]4[/color][color=#007700], [/color][color=#0000bb]s[/color][color=#007700], [/color][color=#0000bb]p[/color][color=#007700];         [/color][color=#0000bb]p [/color][color=#007700]= ([/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]s [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p[/color][color=#007700]*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]a[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]b[/color][color=#007700])*([/color][color=#0000bb]p[/color][color=#007700]-[/color][color=#0000bb]c[/color][color=#007700]));         [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"s = " [/color][color=#007700]+ [/color][color=#0000bb]s[/color][color=#007700]);         [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do 3 goc : "[/color][color=#007700]);         [/color][color=#0000bb]double a [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]/([/color][color=#0000bb]0.5[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])), [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]/([/color][color=#0000bb]0.5[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700])), [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]/([/color][color=#0000bb]0.5[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]));         [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc a : " [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc b : " [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]b[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc c : " [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]todegrees[/color][color=#007700]([/color][color=#0000bb]c[/color][color=#007700]));    }}[/color]

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chấm điểm: do nhầm công thức tính góc, 7 điểm, !

chú ý: bạn nên chọn thẻ code php nhìn cho đẹp code

người chấm điểm: tiasangmoi

trong phần quan hệ logic, chương trình của anh có chỗ (a<=b) là chưa đúng. <= là nhỏ hơn hoặc bằng. thế thì

sosanh = (a < b)&&(a==b);
system.out.println("kết quả so sánh " + a + "<=" + b + " không? " + sosanh);

phải là sosanh = (a < b) || (a==b);

không để là sosanh = (a <=b ) cho nhanh

híc mình k hiểu rõ khi nào dùng boolen, khi nào dùng double và float. cái double và float đều để đặt biến số thực mà.ở bài 2 bạn ấy đặt float nhưng bài 3 tính diện tính lại dùng double. sao bạn biết hay vậy?. ở video k có hướng dẫn mà. híc

**Nhiemtran1** · 11-22-2013, 07:00 AM

mong mọi người giúp đỡ cùng chia sẽ kinh nghiệm.
bài 1:
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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]bai1 [/color][color=#007700]{     [/color][color=#ff8000]/**    * @param args the command line arguments    */    [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// todo code application logic here        [/color][color=#0000bb]int a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]17[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]23[/color][color=#007700];             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen cua " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 la: " [/color][color=#007700]+ ([/color][color=#0000bb]a [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du cua " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 3 la: " [/color][color=#007700]+ ([/color][color=#0000bb]a [/color][color=#007700]% [/color][color=#0000bb]3[/color][color=#007700]));             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen cua " [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 la: " [/color][color=#007700]+ ([/color][color=#0000bb]b [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du cua " [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 3 la: " [/color][color=#007700]+ ([/color][color=#0000bb]b [/color][color=#007700]% [/color][color=#0000bb]3[/color][color=#007700]));             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen cua " [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 2 la: " [/color][color=#007700]+ ([/color][color=#0000bb]c [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du cua " [/color][color=#007700]+ [/color][color=#0000bb]c [/color][color=#007700]+ [/color][color=#dd0000]" khi chia cho 3 la: " [/color][color=#007700]+ ([/color][color=#0000bb]c [/color][color=#007700]% [/color][color=#0000bb]3[/color][color=#007700]));             [/color][color=#0000bb]a[/color][color=#007700]++;        [/color][color=#0000bb]b[/color][color=#007700]++;        [/color][color=#0000bb]c[/color][color=#007700]++;             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"tang gia tri a,b,c moi bien len 1. gia tri moi lan luot la: " [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]"\t" [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]"\t" [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]);    }}[/color]

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bài 2:
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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]bai2 [/color][color=#007700]{     [/color][color=#ff8000]/**    * @param args the command line arguments    */     [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// todo code application logic here        [/color][color=#0000bb]double a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700], [/color][color=#0000bb]x[/color][color=#007700];             [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700]; [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]6[/color][color=#007700]; [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]7[/color][color=#007700];             if ([/color][color=#0000bb]a [/color][color=#007700]== [/color][color=#0000bb]0 [/color][color=#007700]&& ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) == [/color][color=#0000bb]0[/color][color=#007700])            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phuong trinh vo so nghiem!"[/color][color=#007700]);        else if ([/color][color=#0000bb]a [/color][color=#007700]== [/color][color=#0000bb]0 [/color][color=#007700]&& ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) != [/color][color=#0000bb]0[/color][color=#007700])            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phuong trinh vo nghiem!"[/color][color=#007700]);        else{            [/color][color=#0000bb]x [/color][color=#007700]= ([/color][color=#0000bb]8[/color][color=#007700]*[/color][color=#0000bb]c [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) / ([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]);            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phuong trinh co nghiem duy nhat: " [/color][color=#007700]+ [/color][color=#0000bb]x[/color][color=#007700]);            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ep kieu x ve so nguyen: " [/color][color=#007700]+ ((int ) [/color][color=#0000bb]x[/color][color=#007700]));        }       }}[/color]

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bài 3:
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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]bai3 [/color][color=#007700]{     [/color][color=#ff8000]/**    * @param args the command line arguments    */    [/color][color=#007700]public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#ff8000]// todo code application logic here        // nhap do dai 3 canh sao cho tong do dai 2 canh bat ky lon hon canh con lai        [/color][color=#0000bb]int a[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700];        [/color][color=#0000bb]double p[/color][color=#007700], [/color][color=#0000bb]s[/color][color=#007700];        [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]3[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]= [/color][color=#0000bb]4[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]= [/color][color=#0000bb]5[/color][color=#007700];         [/color][color=#ff8000]// tinh dien tich tam giac        [/color][color=#0000bb]p [/color][color=#007700]= ([/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700])/[/color][color=#0000bb]2[/color][color=#007700]; [/color][color=#ff8000]// nua chu vi tam giac        [/color][color=#0000bb]s [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]p [/color][color=#007700]* ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]a[/color][color=#007700]) * ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]b[/color][color=#007700]) * ([/color][color=#0000bb]p [/color][color=#007700]- [/color][color=#0000bb]c[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]p[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]"\t" [/color][color=#007700]+ [/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#dd0000]"\t" [/color][color=#007700]+ [/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"dien tich tam giac la: " [/color][color=#007700]+ [/color][color=#0000bb]s[/color][color=#007700]);        [/color][color=#ff8000]// tinh so do 3 goc cua tam gia abc        // dien tich tam giac: s = 1/2 * (b * c) * sina ==> a = arcsin(2 * s / (b * c))        // so do goc a, b, c        [/color][color=#0000bb]double sina [/color][color=#007700]= ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]s[/color][color=#007700]) / ([/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#0000bb]double sinb [/color][color=#007700]= ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]s[/color][color=#007700]) / ([/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]);        [/color][color=#0000bb]double sinc [/color][color=#007700]= ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]s[/color][color=#007700]) / ([/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc a: " [/color][color=#007700]+ ([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sina[/color][color=#007700])));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc b: " [/color][color=#007700]+ ([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sinb[/color][color=#007700])));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"so do goc c: " [/color][color=#007700]+ ([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]asin[/color][color=#007700]([/color][color=#0000bb]sinc[/color][color=#007700])));    }}[/color]

</blockquote></div>
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**khongbiengioic06** · 12-22-2013, 07:00 AM

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Mã nguồn PHP:


[color=#000000]
[/color][color=#007700]class [/color][color=#0000bb]bai1[/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int a[/color][color=#007700],[/color][color=#0000bb]b[/color][color=#007700],[/color][color=#0000bb]c[/color][color=#007700],[/color][color=#0000bb]d1[/color][color=#007700],[/color][color=#0000bb]d2[/color][color=#007700],[/color][color=#0000bb]d3[/color][color=#007700],[/color][color=#0000bb]t1[/color][color=#007700],[/color][color=#0000bb]t2[/color][color=#007700],[/color][color=#0000bb]t3[/color][color=#007700];        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]6[/color][color=#007700];        [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]7[/color][color=#007700];        [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]8[/color][color=#007700];        [/color][color=#0000bb]t1[/color][color=#007700]=[/color][color=#0000bb]a[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]t2[/color][color=#007700]=[/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]t3[/color][color=#007700]=[/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]d1[/color][color=#007700]=[/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]d2[/color][color=#007700]=[/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]d3[/color][color=#007700]=[/color][color=#0000bb]c[/color][color=#007700]%[/color][color=#0000bb]2[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a/2="[/color][color=#007700]+[/color][color=#0000bb]t1[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"b/2="[/color][color=#007700]+[/color][color=#0000bb]t2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"c/2="[/color][color=#007700]+[/color][color=#0000bb]t3[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a/2 du la "[/color][color=#007700]+[/color][color=#0000bb]d1[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"b/2 du la "[/color][color=#007700]+[/color][color=#0000bb]d2[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"c/2 du la "[/color][color=#007700]+[/color][color=#0000bb]d3[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700]++;[/color][color=#0000bb]b[/color][color=#007700]++;[/color][color=#0000bb]c[/color][color=#007700]++;        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"a sau khi tang la "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"b sau khi tang la "[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"c sau khi tang la "[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]);           }}[/color]

</blockquote></div>
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**toanphuc** · 01-21-2014, 07:00 AM

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Mã nguồn PHP:


[color=#000000]
package edu[/color][color=#007700].[/color][color=#0000bb]javabasic[/color][color=#007700]; [/color][color=#ff8000]/**** @author hung*/[/color][color=#007700]public class [/color][color=#0000bb]bai4_1 [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]int a[/color][color=#007700]=[/color][color=#0000bb]4[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700]=[/color][color=#0000bb]7[/color][color=#007700], [/color][color=#0000bb]c[/color][color=#007700]=[/color][color=#0000bb]9[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan nguyen khi chia a,b,c cho 2 lan luot la:"[/color][color=#007700]+([/color][color=#0000bb]a[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700])+ [/color][color=#dd0000]" ;" [/color][color=#007700]+([/color][color=#0000bb]b[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700])+ [/color][color=#dd0000]" ;"[/color][color=#007700]+([/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]2[/color][color=#007700]));        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"phan du khi chia a,b,c cho 3 lan luot la:"[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]+[/color][color=#dd0000]" ;"[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]+[/color][color=#dd0000]" ;"[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]%[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"sau khi tang len 1 don vi thi a="[/color][color=#007700]+ ++[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#dd0000]"; b="[/color][color=#007700]+ ++[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#dd0000]"; c="[/color][color=#007700]+ ++[/color][color=#0000bb]c[/color][color=#007700]);    }      }[/color]

**gamebt** · 02-05-2014, 07:00 AM

tiasangmoi92 anh có thể giải thích giúp em được không ạ
trituyetdoi = math.abs(a);

system.out.println("giá trị tuyệt đối của a là: "+trituyetdoi);

can = (float) math.sqrt(b);

em không hiểu tại sao lại có float ở phần tính căn. trong khi trị tuyệt đối thì lại không cần phải như vậy

**phuonganh9xx9** · 02-18-2014, 07:00 AM

bài 1:

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Mã:

 public static void main(string[] args) {
        int a = 9, b = 2, c = 1995;
        int phannguyen_a = a / 2, phannguyen_b = b / 2, phannguyen_c = c / 2;
 
        system.out.println("phan nguyen cua " + a + ":2= " + phannguyen_a);
        system.out.println("phan nguyen cua " + b + ":2= " + phannguyen_b);
        system.out.println("phan nguyen cua " + c + ":2= " + phannguyen_c);
 
        int phandu_a = a % 3, phandu_b = b % 3, phandu_c = c % 3;
 
        system.out.println("phan du cua " + a + ":3= " + phandu_a);
        system.out.println("phan du cua " + b + ":3= " + phandu_b);
        system.out.println("phan du cua " + c + ":3= " + phandu_c);
        a++;
        b++;
        c++;
        system.out.println("gia tri cac so sau khi tang la 
 a= " + a + "
 b= " + b + "
 c=" + c);
 
    }

</blockquote></div>
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bài 2:

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Mã:

public static void main(string[] args) {
        float a = 10.5f, b = 12.5f, c = 95f;
        tim_x(a, b, c);
    }
 
    public static void tim_x(float a, float b, float c) {
//      phuong trinh:  2ax+b=8c
        float x;
        if ((8 * c - b) == 0 && (a != 0)) {
            system.out.println("x=0");
        }
        if ((8 * c - b) != 0 && (a != 0)) {
            x = (8 * c - b) / a;
            system.out.println("gia tri kieu int cua \"x\" la: " + (int) x);
        }
        if ((8 * c - b) != 0 && (a == 0)) {
            system.out.println("phuong trinh vo nghiem!");
        }
        if ((8 * c - b) == 0 && (a == 0)) {
            system.out.println("phuong trinh co vo so nghiem!");
        }
 
    }

</blockquote></div>
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bài 3:

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Mã:

 public static void main(string[] args) {
        float a = (float) math.sqrt(2), b = (float) math.sqrt(2), c = 2;
        dientichtamgiac(a, b, c);
        timgoc(a, b, c);
       
    }
 
    public static void dientichtamgiac(float a, float b, float c) {
        double p = (a + b + c) / 2;  //tinh 1/2 chu vi
        double s = math.sqrt(p * (p - a) * (p - b) * (p - c));    //cong thuc heron
        system.out.println("dien tich tam giac la: " + s+" (dvdt)");
       
    }
 
    public static void timgoc(float a, float b, float c) {
        double cosa, cosb, cosc;
       
        cosa = (b * b + c * c - a * a) / (2 * b * c);
        double goca = math.acos(cosa);
        system.out.println("goc thu 1 = " + goca + " (rad)");
       
        cosb = (a * a + c * c - b * b) / (2 * a * c);
        double gocb = math.acos(cosb);
        system.out.println("goc thu 2 = " + gocb + " (rad)");
       
        cosc = (a * a + b * b - c * c) / (2 * a * b);
        double gocc = math.acos(cosc);
        system.out.println("goc thu 3 = " + gocc + " (rad)");
       
    }

</blockquote></div>
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**nguyenkhanhlinh.hy** · 02-19-2014, 07:00 AM

xin nộp bài:
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Mã:

public class baitap1 {
    public static void main(string[] args){
        int a=16,b=17,c=18, nguyena , nguyenb ,nguyenc ,dua ,dub ,duc ;
        nguyena=a/2;
        nguyenb=b/2;
        nguyenc=c/2;
        dua=a%3;
        dub=b%3;
        duc=c%3;
        system.out.println("số nguyên a chia cho 2 là "+ nguyena );
        system.out.println("số nguyên b chia cho 2 là "+ nguyenb );
        system.out.println("số nguyên c chia cho 2 là"+ nguyenc);
        system.out.println("số dư a chia cho 3 là"+dua);
        system.out.println("số dư b chia cho 3 là"+dub);
        system.out.println("số dư c chia cho 3 là"+duc);
        a++;
        b++;
        c++;
        system.out.println("số a tăng lên 1 là"+a);
        system.out.println("số b tăng lên 1 là"+b);
        system.out.println("số c tăng lên 1 là"+c);
                 
  }  }

</blockquote></div>
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bài 2: <div class="bbcodeblock bbcodequote bbcmspoilerblock">
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<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

Mã:

public class baitap2 {
    public static void main(string[] args){
        float a=3,b=4,c=5,x;
        x=(8*c-b)/(2*a);
        system.out.println("kết quả x của phương trình 2ax+b=8c là : "+x);
       int y= (int) x;
        system.out.println("giá trị x sau khi ép thành số nguyên là : "+y);
    }

</blockquote></div>
</div>
</div>
bài 3: <div class="bbcodeblock bbcodequote bbcmspoilerblock">
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Mã:

public class baitap3 {
    public static void main(string[] args){
        double a=3,b=4,c=5,s,p,goca,gocb,gocc,tonggoc;
        p=(a+b+c)/2;
        s=math.sqrt(p*(p-a)*(p-b)*(p-c));
        system.out.println("diện tích hình chữ nhật đã cho là : " +s);
 
        goca=math.todegrees(math.acos((b*b+c*c-a*a)/(2*b*c)));
        gocb=math.todegrees(math.acos((c*c+a*a-b*b)/(2*a*c)));
        gocc=math.todegrees(math.acos((a*a+b*b-c*c)/(2*a*b)));
        tonggoc=goca+gocb+gocc;
 
 
        system.out.println("góc thứ nhất là : "+ goca);
        system.out.println("góc thứ hai là : "+gocb);
        system.out.println("góc thứ ba là : "+gocc);
        system.out.println("tổng 3 góc là : "+tonggoc);
    }

</blockquote></div>
</div>
</div>

Chủ đề: Bài 4: Toán tử và biểu thức, hàm toán học trong Java

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