第五次上机作业

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。(知识点:循环语句、条件语句)

while:

package number5;

public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int i=100,ge,shi,bai;
        while(i<=999){
            ge=i%10;
            shi=i/10%10;
            bai=i/100;
            if(ge*ge*ge+shi*shi*shi+bai*bai*bai==i)
                System.out.println(i);
            i++;
        }
    }

}

        
    

 

 

 

 

2.在控制台输出以下图形(知识点:循环语句、条件语句)

 

package number5;


public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for(int i=1;i<7;i++) {
            for(int j=1;j<=i;j++) {
                System.out.print(j);
            }
            System.out.println();
        }
    }

}


        
    

 

package number5;


public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for(int i=1;i<7;i++) {
            for(int j=1;j<=7-i;j++) {
                System.out.print(j);
            }
            System.out.println();
        }
    }

}


        
    

package number5;


public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for(int i=1;i<7;i++) {
            for(int j=i;j>0;j--) {
                System.out.print(j);
            }
            System.out.println();
        }
    }

}


        
    

package number5;


public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         for(int i=6;i>0;i--) {
             for(int k=0;k<6-i;k++) {
                 System.out.print(" ");
             }
             for(int 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(知识点:循环语句、条件语句)

package number5;

import java.util.Scanner;

public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("输入年:");
        int year = input.nextInt();
        
        System.out.println("输入月:");
        int month = input.nextInt();
        
        System.out.println("输入日:");
        int day = input.nextInt();
        
        int total=0;//统计输入月份之前一共多少天
        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"+total+"");
    }

 

}

        
    

 

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(知识点:循环语句、条件语句)

package number5;

import java.util.Scanner;

public class zzz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub}
        Scanner input = new Scanner(System.in);
        System.out.println("输入四位整数:");
        int i=input.nextInt();
        int ge, shi, bai, qian;
        ge = i / 1000;
        shi = i % 1000 / 100;
        bai = i%1000%100/10;
        qian = i % 1000%100%10;
        System.out.println("反转后:"+(ge + shi * 10 + bai * 100 + qian*1000));
    }

}


        
    

 

 

 

 

 

posted @ 2020-04-02 13:17  洽多  阅读(145)  评论(0编辑  收藏  举报