第五次上机作业

1. ）

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

2.

package calsswork;
import java.util.Scanner;
public class text1 {
    public static void main(String[] args) {
        for(int i=1;i<=7;i++) {
            for(int j=1;j<i;j++) {
                System.out.print(j);
            }
            System.out.println();
        }
    }
}

package hello;
import java.util.Scanner;
public class yes {
    public static void main(String[] args) {
        for(int i=6;i>=0;i--) {
            for(int j=1;j<=i;j++) {
                System.out.print(j);
            }
            System.out.println();
        }
    }

package hello;
import java.util.Scanner;
public class yes {
     public static void main(String[] args) {
            Scanner sc=new Scanner(System.in);
             for(int a=1;a<7;a++) {
                    for(int b=a;b>0;b--) {
                        System.out.print(b);
                    }
                    System.out.println();
        
    }
}
}

package hello;
import java.util.Scanner;
public class yes {
     public static void main(String[] args) {
         
                Scanner sc=new Scanner(System.in);
                for(int a=6;a>0;a--) {
                    for(int b=0;b<6-a;b++) {
                        System.out.print(" ");
                    }
                    for(int i=1;i<=a;i++) {
                        System.out.print(i);
                    }
                    System.out.println("");
                }
            }
        }

3.

package hello;
import java.util.Scanner;
public class yes {
    public static void main(String[] args) {
          int year;
            int mouth;
            int day = 0;
            int days;
            int d = 0; // 累计天数
            int e = 0;
            Scanner scanner = new Scanner(System.in);
            
            //判断输入的年份和月份和日期是否错误
            do {
                System.out.println("输入年:");
                year = scanner.nextInt();
                System.out.println("输入月:");
                mouth = scanner.nextInt();
                System.out.println("输入日:");
                days = scanner.nextInt();
                if (year < 0 || mouth < 0 || mouth > 12 || days < 0 || days > 31) {
                    System.out.println("input error!");
                    e = 1;
                }
            } while (e == 1);
            
            for (int i = 1; i < mouth; i++) {
                switch (i) {
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12: {
                    day = 31;
                    break;
                }
                case 4:
                case 6:
                case 9:
                case 11: {
                    day = 30;
                    break;
                }
                case 2: {
                    if ((year % 100 != 0 && year % 4 == 0) || (year % 100 == 0 && year % 400 == 0)) {
                        day = 29;
                    } else {
                        day = 28;
                    }
                }
                default:
                    break;
                }
                d += day;
            }
            System.out.println("这是" + year + "年的" + (d + days) + "天");
    }
}

4.

package hello;
import java.util.Scanner;
public class yes {
     public static void main(String[] args) {
         
          Scanner sc=new Scanner(System.in);
           System.out.println("请输入一个四位数");
           int x=sc.nextInt();
           
               int gewei=x%10;
               int shiwei=x%10/10;
               int baiwei=x%100/100;
               int qianwei=x/1000;
              
               System.out.println("原先的数为："+x+"现在的为"+(qianwei+baiwei*10+shiwei*100+gewei*1000));
           }
            }