1101作业：循环强化训练

 1 public class Homework01 {
 2     public static void main(String[] args) {
 3         int a=0,b=0,c=0;
 4         System.out.print("3位数的所有水仙花数为：");
 5         for (int i = 100; i < 1000; i++) {
 6             a = i / 100;// 百位
 7             b = i % 100 / 10;// 十位
 8             c = i % 100 % 10;// 个位
 9             if (i == a * a * a + b * b * b + c * c * c) {
10                 System.out.print(i + " ");
11             }
12         }
13     }
14 }

所有水仙花数

 1 public class Homework02 {
 2     public static void main(String[] args) {
 3         double sum = 0, hight = 100;
 4         for (int i = 1; i <= 10; i++) {
 5             sum = sum + 2 * hight;
 6             hight /= 2;
 7             System.out.println("第"+i+"次落地时共经过" + sum + "米，落地后反弹"+hight+"米");
 8         }
 9     }
10 }

皮球反弹

 1 public class Homework03 {
 2     public static void main(String[] args) {
 3         int x, y;
 4         System.out.print("\t1\t2\t3\t4\t5\t6\t7\t8\t9");
 5         for (x = 1; x < 10; x++) {
 6             System.out.print("\n" + x);
 7             for (y = 1; y <= x; y++) {
 8                 System.out.print("\t" + x + "*" + y + "=" + x * y);
 9             }
10
11         }
12     }
13 }

九九乘法表

 1 public class Homework04 {
 2     public static void main(String[] args) {
 3         for (int i = 0; i <=20; i++) {
 4             for (int j = 0; j <Math.abs(10-i); j++) {
 5                 System.out.print(" ");
 6             }
 7             for (int k = 0; k <=(10-Math.abs(i-10)); k++) {
 8                 System.out.print("* ");
 9             }
10             System.out.println();
11         }
12     }
13 }

画菱形