第三周作业

 

package kljjjjj;

public class kljjjjj {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
            System.out.println("输入年份");
            int year=2020;
            if  ( ( 2020 % 4==0 && 2020 % 100!=0)||(2020%400!=0)) {
                System.out.println("闰年");
            }
            else {
                System.out.println("不是闰年");
            }
    } 

package kljjjjjj;
import java.util.*;
public class kljjjjjj {

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

package kljjjjjjj;
    import java.util.Scanner;
    public class kljjjjjjj {
    public static void main(String[] args) {
    Scanner AA = new Scanner(System.in);
    System.out.println("输入三个正整数");
    int a = AA.nextInt();
    int b = AA.nextInt();
    int c = AA.nextInt();
    if (a<=0||b<=0||c<=0){
    System.out.println("输入错误，请重新输入");
    }else if ((a+b)>c&&(a+c)>b&&(b+c)>a){
    System.out.println("能构成三角形");
    }else
    System.out.println("不能构成三角形");
    }
    }

//2.输入一个4位会员卡号,如果百位数字是3的倍数,就输出是幸运会员,否则就输出不是.
    @SuppressWarnings("resource")
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int b=a%1000/100;
        if(a>999||a<10000) {//判断输入是否正确
            if(b%3==0) {
                System.out.println("恭喜您为我们的幸运会员");
            }else{
                System.out.println("很抱歉您不是我们的幸运会员");
            }
        }else {
            System.out.println("输入错误请重新输入");
        }

来源：https://www.cnblogs.com/dh200031/p/12547312.html