Bài 7: Nhập xuất dữ liệu trên giao diện Console

[quanaosi7]

bài 1:
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[color=#000000]
[/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]scanner nhapdulieu [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]string hovaten[/color][color=#007700];         [/color][color=#0000bb]int namsinh[/color][color=#007700];        [/color][color=#0000bb]float dtoan[/color][color=#007700], [/color][color=#0000bb]dly[/color][color=#007700], [/color][color=#0000bb]dhoa[/color][color=#007700], [/color][color=#0000bb]dtb[/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]"nhập họ và tên: "[/color][color=#007700]);        [/color][color=#0000bb]hovaten [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextline[/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]"nhập năm sinh: "[/color][color=#007700]);        [/color][color=#0000bb]namsinh [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"nhập điểm toán: "[/color][color=#007700]);        [/color][color=#0000bb]dtoan [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"nhập điểm lý: "[/color][color=#007700]);        [/color][color=#0000bb]dly [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"nhập điểm hóa: "[/color][color=#007700]);        [/color][color=#0000bb]dhoa [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();               [/color][color=#0000bb]dtb [/color][color=#007700]= ([/color][color=#0000bb]dtoan [/color][color=#007700]+ [/color][color=#0000bb]dly [/color][color=#007700]+ [/color][color=#0000bb]dhoa[/color][color=#007700])/[/color][color=#0000bb]3[/color][color=#007700];               if ( [/color][color=#0000bb]dtb [/color][color=#007700]>= [/color][color=#0000bb]8[/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]"học sinh: " [/color][color=#007700]+ [/color][color=#0000bb]hovaten [/color][color=#007700]+ [/color][color=#dd0000]" là học sinh giỏi"[/color][color=#007700]);            else                if ( [/color][color=#0000bb]dtb [/color][color=#007700]>= [/color][color=#0000bb]6.5 [/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]"học sinh: " [/color][color=#007700]+ [/color][color=#0000bb]hovaten [/color][color=#007700]+ [/color][color=#dd0000]" là học sinh khá"[/color][color=#007700]);                               else                    if ( [/color][color=#0000bb]dtb [/color][color=#007700]>= [/color][color=#0000bb]5[/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]"học sinh: " [/color][color=#007700]+ [/color][color=#0000bb]hovaten [/color][color=#007700]+ [/color][color=#dd0000]" là học sinh trung bình"[/color][color=#007700]);                           }[/color] 

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[huyngoc]

hi all,

mình có thắc mắc như thế này khi nhập chuỗi đối với hàm scanner kết hợp vòng lặp for

yêu cầu (trích từ bài tập ở trên): nhập danh sách sinh viên

note1:
nếu trong code mình không có dòng lệnh "in.nextline();" thì kết quả sẽ không cho nhập từng hàng:

kết quả là:màn hình trả về 2 thông báo "nhập sinh viên thứ 0 và 1" cùng 1 lúc, và chỉ nhập được cho 1 sinh viên , bất chấp "số sinh viên là bao nhiêu"

nhap so sinh vien :
2
nhap sinh vien thu : 0
nhap sinh vien thu : 1

còn nếu ta thêm vào dòng "in.nextline();" thì màn hình sẽ hiển thị thông báo từng dòng cho chúng ta nhập .

note 2:
nếu ở đoạn code trên ta sửa lại
a=in.nextline(); ===> a=in.next();
và bỏ đi dòng lênh "in.nextline();"

kết quả mành hình sẽ cho phép ta nhập cho từng thông báo.

================================================
pro nào giúp mình giải thích trong note1, nếu không có dòng "in.nextline();" thì kết quả tự động trả về 2 thông báo cùng 1 lúc ?

cho mình hỏi, mình nên làm theo note nào (note1 hay note2) trong trường hợp nhập chuỗi với "scanner+ vòng lặp for" thì sẽ tốt hơn

[AlphaBooks]

bài tap

[color=#000000]
import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; public class [/color][color=#0000bb]diem[/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 trungbinh[/color][color=#007700], [/color][color=#0000bb]toan[/color][color=#007700], [/color][color=#0000bb]ly[/color][color=#007700], [/color][color=#0000bb]hoa[/color][color=#007700];        [/color][color=#0000bb]string hoten[/color][color=#007700];        [/color][color=#0000bb]scanner nhapdulieu [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);               [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap điểm toán: "[/color][color=#007700]);        [/color][color=#0000bb]toan [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();               [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap diem ly: "[/color][color=#007700]);        [/color][color=#0000bb]ly [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();               [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap diem hoa: "[/color][color=#007700]);        [/color][color=#0000bb]hoa [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();        [/color][color=#0000bb]trungbinh [/color][color=#007700]= (([/color][color=#0000bb]ly[/color][color=#007700]+[/color][color=#0000bb]hoa[/color][color=#007700]+[/color][color=#0000bb]toan[/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]"diem trung bình 3 môn: " [/color][color=#007700]+ [/color][color=#0000bb]trungbinh[/color][color=#007700]);        if([/color][color=#0000bb]trungbinh [/color][color=#007700]< [/color][color=#0000bb]5[/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]"hoc sinh yeu"[/color][color=#007700]);             } else if([/color][color=#0000bb]trungbinh [/color][color=#007700]> [/color][color=#0000bb]5[/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]"hoc sinh trung bình"[/color][color=#007700]);             } else if([/color][color=#0000bb]trungbinh [/color][color=#007700]> [/color][color=#0000bb]6.5[/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]"hoc sinh kha"[/color][color=#007700]);        } else if([/color][color=#0000bb]trungbinh [/color][color=#007700]> [/color][color=#0000bb]8[/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]"hoc sinh gioi"[/color][color=#007700]);                   }                          } }[/color] 

[kimtan.gl91]

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public class sinhvien {
 
 
    public static void main(string[] args) {
        string ho, ten;
        system.out.print("nhap ho: ");
        ho = nhaphoten();
        system.out.print("nhap ten: ");
        ten = nhaphoten();
        system.out.print("nhap nam sinh: ");
        nhapnam();
        xeploai();
    }
 
    public static string nhaphoten() {
        string s = "";
        scanner input = new scanner(system.in);
        boolean check = true;
        while (check) {
            try {
                s = input.nextline();
                check = false;
            } catch (exception e) {
                system.out.println("chi duoc nhap chu, nhap lai!");
                input.nextline();
            }
        }
        return s;
    }
 
    public static int nhapnam() {
        int n = 0;
        scanner input = new scanner(system.in);
        boolean check = true;
        while (check) {
            try {
                n = input.nextint();
                if (n > 0) {
                    check = false;
                } else {
                    system.out.println("nam phai >0, nhap lai!");
                    input.nextline();
                }
            } catch (exception e) {
                system.out.println("chi duoc nhap so, nhap lai!");
                input.nextline();
            }
        }
        return n;
    }
 
    public static float nhapdiem() {
        float n = 0;
        scanner input = new scanner(system.in);
        boolean check = true;
        while (check) {
            try {
                n = input.nextfloat();
                if (n >= 0 && n <= 10) {
                    check = false;
                } else {
                    system.out.println("diem chi co gia tri tu 0-10, hay nhap lai!");
                    input.nextline();
                }
            } catch (exception e) {
                system.out.println("phai nhap so, nhap lai!");
                input.nextline();
            }
        }
        return n;
    }
 
    public static void xeploai() {
        system.out.println("nhap diem!");
        float diemtoan, diemly, diemhoa;
        system.out.print("diem toan: ");
        diemtoan = nhapdiem();
        system.out.print("diem ly: ");
        diemly = nhapdiem();
        system.out.print("diem hoa: ");
        diemhoa = nhapdiem();
 
        float diemtrungbinh = (diemtoan + diemly + diemhoa) / 3;
        system.out.println("diem trung binh: "+diemtrungbinh);
        system.out.print("xep loai: ");
        if (diemtrungbinh > 8) {
            system.out.println("gioi");
        } else if (diemtrungbinh > 6.5) {
            system.out.println("kha");
        } else if (diemtrungbinh > 5) {
            system.out.println("trung binh");
        } else {
            system.out.println("hen gap lai em nam sau blabla^^.....");
        }
    }
}

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[denledhaledco]

bai 1:
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[color=#000000]
package javabasic[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];public class [/color][color=#0000bb]nhapdulieu [/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]scanner input[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"ho va ten:"[/color][color=#007700]);        [/color][color=#0000bb]string ht[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nam sinh:"[/color][color=#007700]);        [/color][color=#0000bb]int ns[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"diem toan:"[/color][color=#007700]);        [/color][color=#0000bb]float dt[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"diem li:"[/color][color=#007700]);        [/color][color=#0000bb]float dl[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"diem hoa:"[/color][color=#007700]);        [/color][color=#0000bb]float dh[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();        [/color][color=#0000bb]float dtb[/color][color=#007700];        [/color][color=#0000bb]dtb[/color][color=#007700]=(float)(([/color][color=#0000bb]dt[/color][color=#007700]+[/color][color=#0000bb]dl[/color][color=#007700]+[/color][color=#0000bb]dh[/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]"diem trung binh:"[/color][color=#007700]+[/color][color=#0000bb]dtb[/color][color=#007700]);        if([/color][color=#0000bb]dtb[/color][color=#007700]>=[/color][color=#0000bb]5[/color][color=#007700]&[/color][color=#0000bb]dtb[/color][color=#007700]<[/color][color=#0000bb]7[/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]"hoc sinh trung binh"[/color][color=#007700]);        if([/color][color=#0000bb]dtb[/color][color=#007700]>=[/color][color=#0000bb]7[/color][color=#007700]&[/color][color=#0000bb]dtb[/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]"hoc sinh kha"[/color][color=#007700]);        if([/color][color=#0000bb]dtb[/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]"hoc sinh gioi"[/color][color=#007700]);    }}[/color] 

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[anhdakhac0101]

import java.util.scanner:


public class diemtrungbinh {
public static void main(string[] args) {
string hoten;
int namsinh;


float t;
float l;
float h;


scanner nhaplenh=new scanner(system.in);
system.out.println("họ và tên :");
hoten=nhaplenh.nextline();
system.out.println("năm sinh :");
namsinh=nhaplenh.nextint();
system.out.println("điểm toán lý hóa lần lượt là :");
t=nhaplenh.nextfloat();
h=nhaplenh.nextfloat();
l=nhaplenh.nextfloat();
float dtb=(t + l+ h)/3;
system.out.println("dtb"+dtb);
if (dtb>=8){
system.out.println("học lực giỏi ");
}else if (dtb>=6){
system.out.println("học lực khá");
}else{
system.out.println("học lực trung bình");





}



}
}

[/code]

[thanhsvcom]

nộp bài thầy ơi. thầy chưa chấm cho em bài nào hết hic hic:
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[color=#000000]
package baitap7[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; public 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]double toan[/color][color=#007700], [/color][color=#0000bb]ly[/color][color=#007700], [/color][color=#0000bb]hoa[/color][color=#007700], [/color][color=#0000bb]diemtb[/color][color=#007700];        [/color][color=#0000bb]string hovaten[/color][color=#007700];        [/color][color=#0000bb]int namsinh[/color][color=#007700];        [/color][color=#0000bb]string hovaten[/color][color=#007700];        [/color][color=#0000bb]scanner nhapdulieu [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập vào họ và tên sinh viên: "[/color][color=#007700]);        [/color][color=#0000bb]hovaten [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập vào năm sinh: "[/color][color=#007700]);        [/color][color=#0000bb]namsinh [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();        if ([/color][color=#0000bb]namsinh [/color][color=#007700]< [/color][color=#0000bb]1900[/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]"sai năm sinh"[/color][color=#007700]);        } else {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập điểm toán : "[/color][color=#007700]);            [/color][color=#0000bb]toan [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();            if ([/color][color=#0000bb]toan [/color][color=#007700]> [/color][color=#0000bb]10 [/color][color=#007700]|| [/color][color=#0000bb]toan [/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]"sai điểm toán"[/color][color=#007700]);            } else {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập điểm lý : "[/color][color=#007700]);                [/color][color=#0000bb]ly [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();                if ([/color][color=#0000bb]ly [/color][color=#007700]> [/color][color=#0000bb]10 [/color][color=#007700]|| [/color][color=#0000bb]ly [/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]"sai điểm lý"[/color][color=#007700]);                } else {                    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập điểm hóa : "[/color][color=#007700]);                    [/color][color=#0000bb]hoa [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();                    if ([/color][color=#0000bb]hoa [/color][color=#007700]> [/color][color=#0000bb]10 [/color][color=#007700]|| [/color][color=#0000bb]hoa [/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]"sai điểm hóa"[/color][color=#007700]);                    } else {                        [/color][color=#0000bb]diemtb [/color][color=#007700]= [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]round[/color][color=#007700]((([/color][color=#0000bb]toan [/color][color=#007700]+ [/color][color=#0000bb]ly [/color][color=#007700]+ [/color][color=#0000bb]hoa[/color][color=#007700]) / [/color][color=#0000bb]3[/color][color=#007700]) * [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]10[/color][color=#007700], [/color][color=#0000bb]1[/color][color=#007700])) / ([/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]pow[/color][color=#007700]([/color][color=#0000bb]10[/color][color=#007700], [/color][color=#0000bb]1[/color][color=#007700]));[/color][color=#ff8000]/*chỗ này làm tròn số*/                        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"điểm trung bình là: " [/color][color=#007700]+ [/color][color=#0000bb]diemtb[/color][color=#007700]);                        if ([/color][color=#0000bb]diemtb [/color][color=#007700]>= [/color][color=#0000bb]8 [/color][color=#007700]&& [/color][color=#0000bb]diemtb [/color][color=#007700]<= [/color][color=#0000bb]10[/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]"sinh viên này đạt loại giỏi"[/color][color=#007700]);                        }                        if ([/color][color=#0000bb]diemtb [/color][color=#007700]< [/color][color=#0000bb]8 [/color][color=#007700]&& [/color][color=#0000bb]diemtb [/color][color=#007700]>= [/color][color=#0000bb]6.5[/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]"sinh viên này xếp loại khá"[/color][color=#007700]);                        }                        if ([/color][color=#0000bb]diemtb [/color][color=#007700]< [/color][color=#0000bb]6.5 [/color][color=#007700]&& [/color][color=#0000bb]diemtb [/color][color=#007700]>= [/color][color=#0000bb]5[/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]"sinh viên này học trung bình"[/color][color=#007700]);                        }                        if ([/color][color=#0000bb]diemtb [/color][color=#007700]< [/color][color=#0000bb]5[/color][color=#007700]) {                            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"sinh viên này học yếu quá"[/color][color=#007700]);                        }                     }                }            }        }     }}[/color] 

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[nhunglt333]

bài này qua lâu rồi nhưng giờ mới biết đến khóa học nên mới tham khảo tới đây. mình có 1 thắc mắc về việc bắt lỗi năm sinh các bạn chỉ bắt lỗi age >0 chứ không thấy bắt lỗi nhập sai dữ liệu vd nhập vào abcxyz. ai biết cách bắt lỗi này thì chỉ dùm mình với.

[bevoll]

public class bai1 {
public static void main(string[] args) {
    string hoten;
    int namsinh;
    double diemtoan, diemly, diemhoa, dtb;
    scanner in = new scanner(system.in);
    system.out.println("nhap thong tin cho sinh vien:");
    system.out.print("ho ten:");
    hoten = in.nextline();
    system.out.print("nam sinh:");
    namsinh = in.nextint();
    system.out.print("diem hoa:");
    diemhoa = in.nextdouble();
    system.out.print("diem ly:");
    diemly= in.nextdouble();
    system.out.print("diem toan:");
    diemtoan = in.nextdouble();
    dtb =0.0;
    dtb = (diemhoa+ diemly + diemtoan)/3;
    if(dtb < 7.0) {
        system.out.println("hoc luc trung binh");
    }else{
        if(dtb <= 8.0) system.out.println("hoc luc kha");
        else system.out.println("hoc luc gioi");
    }
}
}

[chi chi]

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[color=#000000]
package chapter7[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]/**** @author quangminh*/[/color][color=#007700]public class [/color][color=#0000bb]chapter7 [/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]string hoten[/color][color=#007700];        [/color][color=#0000bb]long namsinh[/color][color=#007700];        [/color][color=#0000bb]float tb[/color][color=#007700], [/color][color=#0000bb]toan[/color][color=#007700], [/color][color=#0000bb]ly[/color][color=#007700], [/color][color=#0000bb]hoa[/color][color=#007700];               [/color][color=#0000bb]scanner nhapdulieu [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap ho va ten: "[/color][color=#007700]);        [/color][color=#0000bb]hoten [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhap nam sinh: "[/color][color=#007700]);        [/color][color=#0000bb]namsinh [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextlong[/color][color=#007700]();        if ([/color][color=#0000bb]namsinh [/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]"nhap sai nam sinh"[/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]"nhap diem toan, ly, hoa: "[/color][color=#007700]);            [/color][color=#0000bb]toan [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();            [/color][color=#0000bb]ly [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();            [/color][color=#0000bb]hoa [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]();            if((([/color][color=#0000bb]toan [/color][color=#007700]< [/color][color=#0000bb]0[/color][color=#007700]) || ([/color][color=#0000bb]toan [/color][color=#007700]> [/color][color=#0000bb]10[/color][color=#007700])) || (([/color][color=#0000bb]ly [/color][color=#007700]< [/color][color=#0000bb]0[/color][color=#007700]) || ([/color][color=#0000bb]ly [/color][color=#007700]> [/color][color=#0000bb]10[/color][color=#007700])) || (([/color][color=#0000bb]hoa [/color][color=#007700]< [/color][color=#0000bb]0[/color][color=#007700]) || ([/color][color=#0000bb]hoa [/color][color=#007700]>[/color][color=#0000bb]10[/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]"nhap sai diem"[/color][color=#007700]);            }            else            {                [/color][color=#0000bb]tb [/color][color=#007700]= (float) ([/color][color=#0000bb]toan [/color][color=#007700]+ [/color][color=#0000bb]ly [/color][color=#007700]+ [/color][color=#0000bb]hoa[/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]"diem trung binh 3 mon: " [/color][color=#007700]+ [/color][color=#0000bb]tb[/color][color=#007700]);                if ([/color][color=#0000bb]tb [/color][color=#007700]< [/color][color=#0000bb]5.0[/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]"hoc luc yeu"[/color][color=#007700]);                }                else                {                    if ([/color][color=#0000bb]tb [/color][color=#007700]< [/color][color=#0000bb]6.5[/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]"hoc luc trung binh"[/color][color=#007700]);                    }                    else                    {                        if([/color][color=#0000bb]tb [/color][color=#007700]< [/color][color=#0000bb]8.0[/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]"hoc luc kha"[/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]"hoc luc gioi"[/color][color=#007700]);                        }                    }                }            }        }                                 }   }[/color] 

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