第三周作业

public class dic {

    public static void main(String[] args) {

 Scanner input=new Scanner(System.in);
 System.out.println("请输入一个年份");
 int m=input.nextInt();
 if (m%4==0 && m%100!=0 ||m%400==0) {
     System.out.println(m+"这个年份是闰年");
 }
 else {
     System.out.println(m+"这个年份不是闰年");
 
 }
 
    }
}

package set;

import java.util.Scanner;

public class delop {

	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 n= input.nextInt();
    int b=n%1000/100;
    if(n>999||n<10000) {
    	if(b%3==0) {
    		System.out.println("是会员");
    
    } else { System.out.println("不是会员");
    
    }}}}

　　

package set;

import java.util.Scanner;

public class dese {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
	    Scanner input=new 	Scanner(System.in);
        int x=input.nextInt();
        if(x>0) {
       	 System.out.println(x+3);
        }
        else if(x==0) {
       	 System.out.println(0);}
        else  if (x<0) {
       	 System.out.println(x*x-1);
        }
       	 
        }
 

	}

　　

package set;

import java.util.Scanner;

public class dese {

	public static void main(String[] args) {
	
		Scanner input=new Scanner(System.in);
		int a=input.nextInt();
		int b=input.nextInt();
		int c=input.nextInt();		
		if (a+b>c && a+c>b && b+c>a ) {
			System.out.println("能组成三角形");
		} else {
			System.out.println("不能形成三角形");
			
		}
       	 
    }

	}