第三次java作业

1.

package set;
import java.util.Scanner;
public class set {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入年份:");
        long year = input.nextLong();
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            System.out.println(year + "是闰年！");
        } else {
            System.out.println(year + "不是闰年");
        }
    }

}

 2.

package set;
import java.util.Scanner;
public class set {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入会员号：");
        int a=input.nextInt();
        if((a%1000/100)%3==0){
            System.out.println("恭喜您是幸运会员");
        }else if(a<1000){
            System.out.println("不是会员号");
        }else{
            System.out.println("抱歉您不是幸运会员");
        }
   }        
}

 3.

package set;
import java.util.Scanner;
public class set {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入x值：");
        int x=input.nextInt();
        if(x>0){
            System.out.println("y的值为"+(x+3)) ;
        }else if(x==0){
            System.out.println("y的值为"+(0));
        }else if(x<0){
            System.out.println("y的值为"+(x*x-1));
        }
   }        
}

 4.

package set;

import java.util.Scanner;

public class set {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.print("请输入第一个数:");
        int a = input.nextInt();
        System.out.println();
        System.out.print("请输入第二个数:");
        int b = input.nextInt();
        System.out.println();
        System.out.print("请输入第三个数:");
        int c = input.nextInt();
        System.out.println();
        if (a + b > c || b + c > b || a + c > a) {
            System.out.println(a + "" + b + "" + c + "" + "可以构成三角形");
        } else {
            System.out.println(a + "" + b + "" + c + "" + "不可以构成三角形");
        }

    }

}