第五周上机作业

1. 打印出所有的"水仙花数"，所谓"水仙花数"是指一个三位数，其各位数字立方和等于该数本身。例如：153是一个"水仙花数"，因为153=1的三次方＋5的三次方＋3的三次方。

package class1;
public class work {

    public static void main(String[] args) {
        int i;
        for(i=100;i<1000;i++){
            int bai=i/100;
            int shi=i/10%10;
            int ge=i%10;
            if(i==ge*ge*ge+bai*bai*bai+shi*shi*shi){
                System.out.println(i);
            }
        }
  }
}

2.

package work;

public class HomeWork {

    public static void main(String[] args) {
        for(int i=1;i<=6;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j);
            }
                System.out.println();
        }
    }
}

package work;

public class HomeWork {

    public static void main(String[] args) {
        for(int i=6;i>=1;i--){
            for(int j=1;j<=i;j++){
                System.out.print(j);
            }
                System.out.println();
        }
    }
}

package work;

public class HomeWork {

    public static void main(String[] args) {
        for (int i = 1; i <= 6; i++) {
            for (int l = 1; l < 7 - i; l++) {
                System.out.print(" ");
            }
            for (int j = i; j > 0; j--) {
                System.out.print(j);
            }
            System.out.println();
        }
    }
}

package work;

public class HomeWork {

    public static void main(String[] args) {
        int i, j, l;
        for (i = 6; i > 0; i--) {
            for (l = 0; l <= 6 - i; l++) {
                System.out.print(" ");
            }
            for (j = 1; j <= i; j++) {
                System.out.print(j);
            }
            System.out.println();
        }

    }
}

 

3. 输入年月日，判断这是这一年中的第几天

package work;

import java.util.*;

public class HomeWork {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入年份:");
        int year = input.nextInt();
        System.out.println("请输入月份:");
        int month = input.nextInt();
        System.out.println("请输入日子:");
        int day = input.nextInt();
        int total = 0;
        for (int i = 1; i < month; i++) {
            switch (i) {
            case 4:
            case 6:
            case 9:
            case 11:
                total += 30;
                break;
            case 2:
                if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
                    total += 29;
                else
                    total += 28;
                break;
            default:
                total += 31;
                break;
            }
        }
        total += day;
        System.out.println("该天是第" + total + "天");

    }
}

4. 由控制台输入一个4位整数，求将该数反转以后的数，如原数为1234，反转后的数位4321

package work;

import java.util.*;

public class HomeWork {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个四位数");
        int i = input.nextInt();
        int qian = i / 1000;
        int bai = i / 100 % 10;
        int shi = i / 10 % 10;
        int ge = i % 10;
        System.out.println("原数为：" + i + "转换为" + (qian + bai * 10 + shi * 100 + ge * 1000));
    }
}