Bài 5: Cấu trúc if ..else, biểu thức boolean và coding style trong Java

[phongthuysim1]

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[color=#000000]
[/color][color=#007700]class [/color][color=#0000bb]tamgiac[/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]1f[/color][color=#007700];        [/color][color=#0000bb]float b[/color][color=#007700]=[/color][color=#0000bb]2f[/color][color=#007700];        [/color][color=#0000bb]float c[/color][color=#007700]=[/color][color=#0000bb]2f[/color][color=#007700];    if([/color][color=#0000bb]a[/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]c[/color][color=#007700]>[/color][color=#0000bb]a[/color][color=#007700]&&[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]c[/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]"day la ba canh cua tam giac "[/color][color=#007700]);        if([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]||[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]a[/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]c[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]==[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]){            if([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b[/color][color=#007700]||[/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c[/color][color=#007700]||[/color][color=#0000bb]c[/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]"day la tam giac vuong can "[/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]"day la tam giac vuong"[/color][color=#007700]);}        else        if([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b[/color][color=#007700]&&[/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c[/color][color=#007700]&&[/color][color=#0000bb]c[/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]"day la tam giac deu "[/color][color=#007700]);        else        if([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b[/color][color=#007700]||[/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c[/color][color=#007700]||[/color][color=#0000bb]c[/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]"day la tam giac can " [/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]"day la tam giac thuong"[/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]"day khong phai ba canh cua mot tam giac "[/color][color=#007700]);                   }      }[/color] 

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nếu điều kiện này như dưới thì là thừa rồi, nếu a = 1; b =1; c =2; thế thì if dưới này false rồi mặc dù nó vẫn là 1 tam giác. ta nên dùng || thì đúng hơn.

if(a+b>c&&b+c>a&&a+c>b)

[huantrano0o]

nhập 3 cạnh từ bàn phím in ra tam giác cân. các pro giúp e với ạ.

[viendaotaovn]

nhập 3 cạnh từ bàn phím in ra tam giác cân. các pro giúp e với ạ.

bạn hỏi như vậy là sao? nhập 3 cạnh từ bàn phím, kiểm tra xem là loại tam giác gì? hay nhập 3 cạnh của 1 tam giác cân từ bàn phím và in ra màn hình hình vẽ thể hiện tam giác đó trên màn hình?

[TiNHoT1875]

nhờ mọi người kiểm tra hộ, chạy thử rồi, ngon
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package javaapplication2[/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]7[/color][color=#007700], [/color][color=#0000bb]b[/color][color=#007700];        if ([/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]5[/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]"a chia hết cho 5"[/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]"thương"[/color][color=#007700]+[/color][color=#0000bb]a[/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]"dư"[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]5[/color][color=#007700]);        }    } }[/color] 

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[color=#000000]
package javaapplication2[/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]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]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];        if ([/color][color=#0000bb]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]c[/color][color=#007700]>[/color][color=#0000bb]b [/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]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"a, b, c là độ dài 3 cạnh của một tam giác "[/color][color=#007700]);            if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/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]sqrt[/color][color=#007700]([/color][color=#0000bb]a[/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]c[/color][color=#007700]==[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700])) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"vuông "[/color][color=#007700]);                  if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b [/color][color=#007700]|| [/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c [/color][color=#007700]|| [/color][color=#0000bb]c[/color][color=#007700]==[/color][color=#0000bb]a[/color][color=#007700]) {                    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"cân"[/color][color=#007700]);                    }                  }            if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b [/color][color=#007700]|| [/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c [/color][color=#007700]|| [/color][color=#0000bb]c[/color][color=#007700]==[/color][color=#0000bb]a[/color][color=#007700]) {              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"cân"[/color][color=#007700]);            }            if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]b [/color][color=#007700]&& [/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c [/color][color=#007700]&& [/color][color=#0000bb]c[/color][color=#007700]==[/color][color=#0000bb]a[/color][color=#007700]) {              [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"đều"[/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]"a, b, c không phải là độ dài 3 cạnh của một tam giác"[/color][color=#007700]);        }    }}[/color] 

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[color=#000000]
package javaapplication2[/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]float 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]x1[/color][color=#007700], [/color][color=#0000bb]x2 [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700], [/color][color=#0000bb]denta[/color][color=#007700];        [/color][color=#0000bb]a[/color][color=#007700]=[/color][color=#0000bb]1[/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]1[/color][color=#007700];        if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]0 [/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]"không phai phương trình bậc 2"[/color][color=#007700]);            [/color][color=#0000bb]x[/color][color=#007700]=-[/color][color=#0000bb]c[/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]"phương trình có nghiệm:"[/color][color=#007700]+[/color][color=#0000bb]x[/color][color=#007700]);            }        if ([/color][color=#0000bb]a[/color][color=#007700]==[/color][color=#0000bb]0 [/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]"phương trình vô nghiệm"[/color][color=#007700]);        }        if ([/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]0 [/color][color=#007700]&& [/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/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]"phương trình vô nghiệm"[/color][color=#007700]);                   }        if ([/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]0 [/color][color=#007700]&& [/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]<[/color][color=#0000bb]0[/color][color=#007700]){            [/color][color=#0000bb]x1[/color][color=#007700]=(float) [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700](-[/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]a[/color][color=#007700]);            [/color][color=#0000bb]x2[/color][color=#007700]=(float) -[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700](-[/color][color=#0000bb]c[/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]"nghiệm của phương trình là:"[/color][color=#007700]+[/color][color=#0000bb]x1[/color][color=#007700]+[/color][color=#dd0000]", "[/color][color=#007700]+[/color][color=#0000bb]x2[/color][color=#007700]);        }        if ([/color][color=#0000bb]a[/color][color=#007700]!=[/color][color=#0000bb]0 [/color][color=#007700]&& [/color][color=#0000bb]b[/color][color=#007700]!=[/color][color=#0000bb]0[/color][color=#007700]){                      [/color][color=#0000bb]denta[/color][color=#007700]=[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]-[/color][color=#0000bb]4[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700];        if ([/color][color=#0000bb]denta[/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]"phương trình vô nghiệm"[/color][color=#007700]);        }        if ([/color][color=#0000bb]denta[/color][color=#007700]==[/color][color=#0000bb]0[/color][color=#007700]){            [/color][color=#0000bb]x[/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]"phương trình có nghiệm kép x1 = x2 = x = "[/color][color=#007700]+[/color][color=#0000bb]x[/color][color=#007700]);        }        if ([/color][color=#0000bb]denta[/color][color=#007700]>[/color][color=#0000bb]0[/color][color=#007700]){            [/color][color=#0000bb]x1[/color][color=#007700]=(float) ((-[/color][color=#0000bb]b[/color][color=#007700]-[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]denta[/color][color=#007700]))/([/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]));            [/color][color=#0000bb]x2[/color][color=#007700]=(float) ((-[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]denta[/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]"phương trình có 2 nghiệm: x1 = "[/color][color=#007700]+[/color][color=#0000bb]x1[/color][color=#007700]+[/color][color=#dd0000]", x2 = "[/color][color=#007700]+[/color][color=#0000bb]x2[/color][color=#007700]);        }        }  }}[/color] 

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[wrtgsgff]

bai 1:

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[/color][color=#007700]public class [/color][color=#0000bb]ifelse [/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]int a[/color][color=#007700];        [/color][color=#0000bb]a [/color][color=#007700]= [/color][color=#0000bb]9[/color][color=#007700];        if ( ([/color][color=#0000bb]a [/color][color=#007700]% [/color][color=#0000bb]5[/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=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" la so chia het cho 5. "[/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]"thuong va so du trong phep chia (" [/color][color=#007700]+ [/color][color=#0000bb]a [/color][color=#007700]+ [/color][color=#dd0000]" : 5) la:" [/color][color=#007700]+ ([/color][color=#0000bb]a [/color][color=#007700]/ [/color][color=#0000bb]5[/color][color=#007700]) + [/color][color=#dd0000]", " [/color][color=#007700]+ ([/color][color=#0000bb]a [/color][color=#007700]% [/color][color=#0000bb]5[/color][color=#007700]) );        }    } }[/color] 

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bai 2:

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[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]ifelse2 [/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 ab[/color][color=#007700], [/color][color=#0000bb]ac[/color][color=#007700], [/color][color=#0000bb]bc[/color][color=#007700];[/color][color=#ff8000]//3 canh cua tam giac abc               [/color][color=#0000bb]ab [/color][color=#007700]= [/color][color=#0000bb]3[/color][color=#007700];[/color][color=#ff8000]// 5 cm        [/color][color=#0000bb]ac [/color][color=#007700]= [/color][color=#0000bb]3[/color][color=#007700];[/color][color=#ff8000]// 6 cm        [/color][color=#0000bb]bc [/color][color=#007700]= [/color][color=#0000bb]18[/color][color=#007700];[/color][color=#ff8000]// 7 cm        [/color][color=#007700]if([/color][color=#0000bb]ab [/color][color=#007700]<= [/color][color=#0000bb]0 [/color][color=#007700]|| [/color][color=#0000bb]ac [/color][color=#007700]<= [/color][color=#0000bb]0 [/color][color=#007700]|| [/color][color=#0000bb]bc [/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]"abc khong la tam giac"[/color][color=#007700]);        if(([/color][color=#0000bb]ab [/color][color=#007700]+ [/color][color=#0000bb]ac[/color][color=#007700]) > [/color][color=#0000bb]bc [/color][color=#007700]&& ([/color][color=#0000bb]ab [/color][color=#007700]+ [/color][color=#0000bb]bc[/color][color=#007700]) > [/color][color=#0000bb]ac [/color][color=#007700]&& ([/color][color=#0000bb]ac [/color][color=#007700]+ [/color][color=#0000bb]bc[/color][color=#007700]) > [/color][color=#0000bb]ab[/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]"abc la tam giac"[/color][color=#007700]);                    [/color][color=#ff8000]//tam giac can                    [/color][color=#007700]if(([/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]ac[/color][color=#007700]) || ([/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]bc[/color][color=#007700]) || ([/color][color=#0000bb]bc [/color][color=#007700]== [/color][color=#0000bb]ac[/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]"abc la tam giac can"[/color][color=#007700]);                    [/color][color=#ff8000]//tamgiacdeu                    [/color][color=#007700]if(([/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]ac[/color][color=#007700]) && ([/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]bc[/color][color=#007700]) && ([/color][color=#0000bb]bc [/color][color=#007700]== [/color][color=#0000bb]ac[/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]"abc la tam giac deu"[/color][color=#007700]);                                       [/color][color=#ff8000]//tamgiacvuong                    [/color][color=#0000bb]boolean pitagoa [/color][color=#007700]= ( [/color][color=#0000bb]bc [/color][color=#007700]== [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700](([/color][color=#0000bb]ab [/color][color=#007700]* [/color][color=#0000bb]ab[/color][color=#007700]) + ([/color][color=#0000bb]ac [/color][color=#007700]* [/color][color=#0000bb]ac[/color][color=#007700]) ) );                    [/color][color=#0000bb]boolean pitagob [/color][color=#007700]= ( [/color][color=#0000bb]ac [/color][color=#007700]== [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700](([/color][color=#0000bb]ab [/color][color=#007700]* [/color][color=#0000bb]ab[/color][color=#007700]) + ([/color][color=#0000bb]bc [/color][color=#007700]* [/color][color=#0000bb]bc[/color][color=#007700]) ) );                    [/color][color=#0000bb]boolean pitagoc [/color][color=#007700]= ( [/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700](([/color][color=#0000bb]ac [/color][color=#007700]* [/color][color=#0000bb]ac[/color][color=#007700]) + ([/color][color=#0000bb]bc [/color][color=#007700]* [/color][color=#0000bb]bc[/color][color=#007700]) ) );                    if([/color][color=#0000bb]pitagoa [/color][color=#007700]|| [/color][color=#0000bb]pitagob [/color][color=#007700]|| [/color][color=#0000bb]pitagoc[/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]"abc la tam giac vuong "[/color][color=#007700]);                    [/color][color=#ff8000]//tamgiacvuongcan                                       [/color][color=#0000bb]pitagoa [/color][color=#007700]= [/color][color=#0000bb]pitagoa [/color][color=#007700]& ([/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]ac[/color][color=#007700]);                    [/color][color=#0000bb]pitagob [/color][color=#007700]= [/color][color=#0000bb]pitagoa [/color][color=#007700]& ([/color][color=#0000bb]ab [/color][color=#007700]== [/color][color=#0000bb]bc[/color][color=#007700]);                    [/color][color=#0000bb]pitagoc [/color][color=#007700]= [/color][color=#0000bb]pitagoa [/color][color=#007700]& ([/color][color=#0000bb]bc [/color][color=#007700]== [/color][color=#0000bb]ac[/color][color=#007700]);                                       if([/color][color=#0000bb]pitagoa [/color][color=#007700]|| [/color][color=#0000bb]pitagob [/color][color=#007700]|| [/color][color=#0000bb]pitagoc[/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]"abc la tam giac vuong can "[/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]"abc khong la tam giac"[/color][color=#007700]);        }           }[/color] 

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

bai 3

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[color=#000000]
[/color][color=#007700]public class [/color][color=#0000bb]ifelse3 [/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=#0000bb]a [/color][color=#007700]=  [/color][color=#0000bb]1d[/color][color=#007700];        [/color][color=#0000bb]b [/color][color=#007700]= -[/color][color=#0000bb]4d[/color][color=#007700];        [/color][color=#0000bb]c [/color][color=#007700]= -[/color][color=#0000bb]5d[/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]0[/color][color=#007700]){                if([/color][color=#0000bb]c [/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 co vo so nghiem x"[/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 vo nghiem"[/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 co nghiem bac nhat duy nhat:x = " [/color][color=#007700]+ ( -[/color][color=#0000bb]c  [/color][color=#007700]/ [/color][color=#0000bb]b [/color][color=#007700]) );        } else {            [/color][color=#0000bb]double delta [/color][color=#007700]= ([/color][color=#0000bb]b [/color][color=#007700]* [/color][color=#0000bb]b[/color][color=#007700]) - ([/color][color=#0000bb]4 [/color][color=#007700]* [/color][color=#0000bb]a [/color][color=#007700]* [/color][color=#0000bb]c[/color][color=#007700]);            if([/color][color=#0000bb]delta [/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 co nghiem kep: x = " [/color][color=#007700]+ ( -[/color][color=#0000bb]b [/color][color=#007700]/ [/color][color=#0000bb]2[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]) );            if([/color][color=#0000bb]delta [/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]);            [/color][color=#0000bb]double x1 [/color][color=#007700]= (-[/color][color=#0000bb]b [/color][color=#007700]+ [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]delta[/color][color=#007700])) / ([/color][color=#0000bb]2 [/color][color=#007700]* [/color][color=#0000bb]a[/color][color=#007700]);            [/color][color=#0000bb]double x2 [/color][color=#007700]= (-[/color][color=#0000bb]b [/color][color=#007700]- [/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]delta[/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 2 nghiem phan biet: x1 = " [/color][color=#007700]+ [/color][color=#0000bb]x1 [/color][color=#007700]+ [/color][color=#dd0000]", x2 = " [/color][color=#007700]+ [/color][color=#0000bb]x2[/color][color=#007700]);        }    } }[/color] 

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

[dichvuseoduyanh123]

bạn hỏi như vậy là sao? nhập 3 cạnh từ bàn phím, kiểm tra xem là loại tam giác gì? hay nhập 3 cạnh của 1 tam giác cân từ bàn phím và in ra màn hình hình vẽ thể hiện tam giác đó trên màn hình?

nhập 3 cạnh từ bàn phím. in ra màn hình hình vẽ cua tam giác đó

[minhquan1910]

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[color=#000000]
[/color][color=#007700]class [/color][color=#0000bb]javabasic1[/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]12[/color][color=#007700];      if([/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]5[/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]"so a chi het cho 5"[/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]"thuong cua a chia cho 5 la :"[/color][color=#007700]+([/color][color=#0000bb]a[/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]"so du cua a chia cho 5 la :"[/color][color=#007700]+([/color][color=#0000bb]a[/color][color=#007700]%[/color][color=#0000bb]5[/color][color=#007700]));      }    }}[/color] 

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

[cuongits]

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[color=#000000]
[/color][color=#007700]class [/color][color=#0000bb]bai2[/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]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]12[/color][color=#007700];        if([/color][color=#0000bb]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]c[/color][color=#007700]<=[/color][color=#0000bb]b[/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]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"day khong phai la do dai ba canh cua tam giac"[/color][color=#007700]);        }        else        {            if([/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]+[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]==[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]c [/color][color=#007700]|| [/color][color=#0000bb]a[/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]b[/color][color=#007700]*[/color][color=#0000bb]b [/color][color=#007700]|| [/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]c[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700]==[/color][color=#0000bb]a[/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]"day la tam giac vuong"[/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]"day la tam giac thuong"[/color][color=#007700]);            }        }    }}[/color] 

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

[tram_tron]

bai 3 của e đây
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[color=#000000]
[/color][color=#007700]class [/color][color=#0000bb]bai2[/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]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]0[/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]1[/color][color=#007700];      if([/color][color=#0000bb]a[/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]"day khong phai la phuong trinh bac 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]"phuong trinh co nghiem la "[/color][color=#007700]+ (-([/color][color=#0000bb]c[/color][color=#007700]/[/color][color=#0000bb]b[/color][color=#007700])));      }      else      {          [/color][color=#0000bb]double delta[/color][color=#007700],[/color][color=#0000bb]x1[/color][color=#007700],[/color][color=#0000bb]x2[/color][color=#007700];          [/color][color=#0000bb]delta [/color][color=#007700]=[/color][color=#0000bb]b[/color][color=#007700]*[/color][color=#0000bb]b[/color][color=#007700]-[/color][color=#0000bb]4[/color][color=#007700]*[/color][color=#0000bb]a[/color][color=#007700]*[/color][color=#0000bb]c[/color][color=#007700];          [/color][color=#0000bb]x1[/color][color=#007700]=(-[/color][color=#0000bb]b[/color][color=#007700]-[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]delta[/color][color=#007700]))/[/color][color=#0000bb]2[/color][color=#007700];          [/color][color=#0000bb]x2[/color][color=#007700]=(-[/color][color=#0000bb]b[/color][color=#007700]+[/color][color=#0000bb]math[/color][color=#007700].[/color][color=#0000bb]sqrt[/color][color=#007700]([/color][color=#0000bb]delta[/color][color=#007700]))/[/color][color=#0000bb]2[/color][color=#007700];          if([/color][color=#0000bb]delta[/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 co nghiem kep x1=x2="[/color][color=#007700]+[/color][color=#0000bb]x1[/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]"{huong trinh co 2 nghiem phan biet la x1="[/color][color=#007700]+[/color][color=#0000bb]x1[/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]"{huong trinh co 2 nghiem phan biet la x2="[/color][color=#007700]+[/color][color=#0000bb]x2[/color][color=#007700]);          }      }    }}[/color] 

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

[seoaloola]

bài 3 nhé:
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import java.util.scanner;
public class pt_2{
  public static void main(string[] args){
      float a,b,c,x1,x2,del;
      scanner keyboard = new scanner(system.in);
      system.out.print("a=");
      a=keyboard.nextfloat();
      system.out.print("b=");
      b=keyboard.nextfloat();
      system.out.print("c=");
      c=keyboard.nextfloat();
      if(a==0)
          if(b==0)
              if(c==0) system.out.println("phuong tring vo so nghiem!");
      else
                  system.out.println("phuong tring vo nghiem");
      else//b!=0
              system.out.println("phuong trinh co nghiem="+(-c/b));
      else
      {
          del=b*b-4*a*c;
          if(del<0)system.out.println("phuong trinh vo nghiem");
          else
              if(del==0)
              {
                x1=x2=-b/(2*a);
                system.out.println("phuong trinh co nghiem kep"+x1);
              }
              else // del>0
              {
                  x1=(float)(-b+math.sqrt(del))/(2*a);
                  x2=(float)(-b-math.sqrt(del))/(2*a);
                  system.out.println("phuong trinh co 2 nghiem 
 x1= "+x1+"
x2="+x2);
                  }
      }
  }
}

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