package org.westos.www;

/*1.给定一个年份，判断是否是闰年。A：能被4整除，并且不能被100整除 或者 B：能被400整除。*/

import java.util.Scanner;

public class Runnian

{

 public static void main(String[] args)

 {   Scanner scan=new Scanner(System.in);  System.out.println("请输入年份：");  int x=scan.nextInt();  if(x%4==0&&x%100!=0)   {    System.out.println("今年是闰年");  }  else if(x%400==0)  {    System.out.println("今年是闰年");  }

 }

}

package org.westos.www;

public class chicken

{

 public static void main(String[] args)

 {   for(int x=1;x<100;x++)   {    for(int y=1;y<100-x;y++)    {     int z=100-x-y;    if(5*x+3*y+1/3*z==100 && x+y+z==100)     {      System.out.println("小鸡 =" + x);     System.out.println("母鸡 =" + y);     System.out.println("公鸡 =" + z);     System.out.println();         }   }  }         

 }

}

package org.westos.www;

public class twoadd{

 public static void main(String[] args)

 { /*  int i=0,sum=0;  int count=0;  while(count<5)   {    count++;   i=i*10+2;   sum+=i;  }   System.out.println("sum="+sum); */  int i=0,sum=0;  for(int n=1;n<=5;n++)   {    i=i*10+2;   sum+=i;  }  System.out.println("sum="+sum);   }

}