Java_2上课练习

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 demo3;

import java.util.Scanner;
import java.util.concurrent.SynchronousQueue;
public class day01 {

    public static void main(String[] args) {
           int n,ge,shi,bai;
           for(n=100;n<=999;n++)
             {
               ge=n%100%10;
               shi=n%100/10;
               bai=n/100;
               if(ge*ge*ge+bai*bai*bai+shi*shi*shi==n)
               {
                   System.out.println(n);
               }
             }
           
          
      }
    
 }

2.在控制台输出以下图形（知识点：循环语句、条件语句）正三角，倒三角
package demo3;

import java.util.Scanner;
import java.util.concurrent.SynchronousQueue;
public class day01 {

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

package demo3;

import java.util.Scanner;
import java.util.concurrent.SynchronousQueue;
public class day01 {

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




package demo3;

import java.util.Scanner;
import java.util.concurrent.SynchronousQueue;
public class day01 {

    public static void main(String[] args) {
           int n,i,x;
           for(n=1;n<=6;n++)
             {
                       for (x = n; x <=5 ; x++) {
                           System.out.print(" ");
                       }
                               for (i = n; i>0 ; i--) {
                                       System.out.print(i);
                                       }
                               System.out.println();
                    }
                   System.out.println();
              }
        }
           
    

package demo3;

import java.util.Scanner;
import java.util.concurrent.SynchronousQueue;
public class day01 {

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