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）

package qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int ge,shi,bai;
        for(int i=100;i<1000;i++){
            ge=i%10;
            shi=i/10%10;
            bai=i/100;
          if(i==ge*ge*ge+shi*shi*shi+bai*bai*bai){
              System.out.println(i);
          }
        }
        
        
    }

}

2.

在控制台输出以下图形（知识点：循环语句、条件语句）

package qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int ge,shi,bai;
        for(int i=100;i<1000;i++){
            ge=i%10;
            shi=i/10%10;
            bai=i/100;
          if(i==ge*ge*ge+shi*shi*shi+bai*bai*bai){
              System.out.println(i);
          }
        }
        
        
    }

}


package qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        for(int i=1;i<=6;i++){
            for(int j=1;j<i;j++){
                System.out.print(j);
            }
        
              System.out.println(i);
          }
        }
        
        
}


package qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        for(int i=1;i<=6;i++){
            for(int j=1;j<=7-i;j++){
                System.out.print(j);
            }
            System.out.println();
         }
        
        }
        
        
    }



package qq;
import java.util.Scanner;

public class Cc {

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



package qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
           for(int n=6;n>=0;n--) {
                for(int j=1;j<=n;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 qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int a=input.nextInt();
        int b=input.nextInt();
        int c=input.nextInt();
        int x=0;
          if(a%4==0 &&a%100!=0 ||a%400==0) {
                switch(b) {
                case 1:  x=31+c; break;
                case 2:  x=31+29+c;break;
                case 3:  x=31+29+31+c;break;
                case 4:  x=31+29+31+30+c;break;
                case 5:  x=31+29+31+30+31+c;break;
                case 6:  x=31+29+31+30+31+30+c;break;
                case 7:  x=31+29+31+30+31+30+31+c;break;
                case 8:  x=31+29+31+30+31+30+31+31+c;break;
                case 9:  x=31+29+31+30+31+30+31+31+30+c;break;
                case 10: x=31+29+31+30+31+30+31+31+30+31+c;break;
                case 11: x=31+29+31+30+31+30+31+31+30+31+30+c;break;
                case 12: x=31+29+31+30+31+30+31+31+30+31+30+31+c;break;
                }
            }else {
                switch(b) {
                case 1:  x=31+c;break;
                case 2:  x=31+28+c;break;
                case 3:  x=31+28+31+c;break;
                case 4:  x=31+28+31+30+c;break;
                case 5:  x=31+28+31+30+31+c;break;
                case 6:  x=31+28+31+30+31+30+c;break;
                case 7:  x=31+28+31+30+31+30+31+c;break;
                case 8:  x=31+28+31+30+31+30+31+31+c;break;
                case 9:  x=31+28+31+30+31+30+31+31+30+c;break;
                case 10: x=31+28+31+30+31+30+31+31+30+31+c;break;
                case 11: x=31+28+31+30+31+30+31+31+30+31+30+c;break;
                case 12: x=31+28+31+30+31+30+31+31+30+31+30+31+c;break;
                }
            }
            System.out.println(x);
    }
}

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 qq;
import java.util.Scanner;

public class Cc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入一个四位数");
        int x=input.nextInt();
        int a=x%10;
        int b=x/10%10;
        int c=x/100%10;
        int d=x/1000;
        System.out.println("变换后的数为："+a+b+c+d);
        
    }
}