第五周上机练习

1.

package test;
public class LH {

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

2.

package test;

public class LH {

    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 test;

public class LH {

    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 test;

public class LH {

    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 test;

public class LH {

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

    }
}

3.

package test;

import java.util.*;

public class LH {

    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.

package test;
import java.util.Scanner;
public class LH {
      public static void main(String[] args) {
          Scanner sc = new Scanner(System.in);
          System.out.println("请输入一个四位数：");
          int i = sc.nextInt();
          int q = i/1000%10;
          int b = i/100%10;
          int s = i/10%10;
          int g = i%10;
          int n;
          reverse = g*1000+s*100+b*10+q;
          System.out.println("反转后为："+n);
          }
      }