Java学习Day013(循环结构练习其二)

11：A、B、C、D分别为0——9之间的整数，求出满足AB+CD=DA条件的数。

    例如：90+09=99

package com.baqn.demo02;

public class WordDome11 {

   public static void main(String[] args) {

     for(int a = 0; a <= 9; a++){

        for(int b = 0; b <= 9 ; b++){

           int num1 = a*10 + b;

           for(int c = 0; c <= 9; c++){

             for(int d = 0;d <= 9; d++){

                int num2 = c*10 + d;

                int num3 = d*10 + a;

                if(num1 + num2==num3){

                System.out.println("a是:" + a + ",b是:" + b + ",c是" + c + ",d是" + d);

                System.out.println(num3);               }

             }

           }

        }           

     } 

   }

}

12：随机生成一个五位以内的数，然后输出该数共有多少位，每位分别是什么

package com.baqn.demo02;

public class WordDome12 {

   public static void main(String[] args) {

     int num = (int) (Math.random() * 99999);

     System.out.println("随机生成的五位以内的数字为:" + num);

     int num1 = 1;

     while (num != 0) {

        int location = num % 10;

        num = num / 10;

        System.out.println("倒数第" + num1 + "位" + "位:" + location);

        num1++;

     }

     System.out.println("这个随机数的有" + (num1 - 1) + "位数");

   }

}

13：输出九九乘法表

package com.baqn.demo02;

public class WordDome13 {

   public static void main(String[] args) {

     for(int i = 1; i <= 9; i++){

        for(int j = 1; j <= i; j++){

           System.out.print(j + "*" + i + "=" + (j*i) + "\t");

           if(j == i){

             System.out.println();

           }

        }

     }

   }

}

14：使用Java实现输出如下图形。(三角形,菱形)