第三次java作业

1.package yugh;
import java.util.Scanner;
public class pkp {
	public static void main(String[] args){
	Scanner in=new Scanner(System.in);
	System.out.println("输入年份");
	int year=in.nextInt();
	if((year%4==0&&year%100!=00)||(year%400==0))
	{
		System.out.println(year+"是一个闰年");
	}else
	{
		System.out.println(year+"是一个平年");
	}
	}
}

　　

2.

package yugh;
import java.util.Scanner;
public class pkp {
	    public static void main(String[] args) {
	        Scanner input =new Scanner(System.in);
	        System.out.println("输入一个4位会员卡号：");
	        int a=input.nextInt();
	        int b=a/100%10;
	        if(b%3==0){
	            System.out.println("是幸运会员");
	        }else{
	            System.out.println("不是幸运会员");
	        }
	    }
}

3.

package yugh;
import java.util.Scanner;
public class pkp {
	  public static void main(String[] args) {
	        Scanner input=new Scanner(System.in );
	        System.out.println("输入x的值");
	        int x=input.nextInt();
	        int y;
	        if(x>0){
	            y=x+3;
	        }else if(x<0){
	            y=x*2-1;
	        }else{
	            y=0;
	        }
	        System.out.println("y的值为："+y);
	    }

	}