第二次作业上交~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~武汉加油！

1.输入一个年份,判断是不是闰年(能被4整除但不能被100整除,或者能被400整除)

package kl;

import java.util.Arrays;
import java.util.Scanner;

public class aac {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("请输入一个年份:");
        Scanner y=new Scanner(System.in);
        int year=y.nextInt();
        if(year%4==0 && year%100!=0 || year%400==0)
        {
            System.out.println("该年是闰年");
        }else {
            System.out.println("该年不是闰年");
        }
}
}

 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.

package kl;

import java.util.Arrays;
import java.util.Scanner;

public class aac {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("输入一个4位会员卡号:");
        Scanner k=new Scanner(System.in);
        int kahao=k.nextInt();
        if((kahao/100%10)%3==0) 
        {
            System.out.println("恭喜你成为超级会员");
        }else {
            System.out.println("非常遗憾你并没有成为超级会员");
        }
    }
}

 3.已知函数,输入x的值,输出对应的y的值.
        x + 3 ( x > 0 )
y =  0 ( x = 0 )
        x*2 –1 ( x < 0 )

package kl;

import java.util.Arrays;
import java.util.Scanner;

public class aac {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("请输入一个x值:");
        Scanner a=new Scanner(System.in);
        int shu=a.nextInt();
        int chu;
        if(shu>0)
        {
            System.out.println("输出的y值为:"+(shu+3));
        }else if(shu==0)
        {
            System.out.println("输出的y值为:"+(shu=0));
        }else if(shu<0)
        {
            System.out.println("输出的y值为:"+(shu*2-1));
        }
        System.out.println("------------------------------------");

    }
}

 4.输入三个数,判断能否构成三角形(任意两边之和大于第三边)

package kl;

import java.util.Arrays;
import java.util.Scanner;

public class aac {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("请输入三个数:");
        Scanner cxk=new Scanner(System.in);
        int a=cxk.nextInt();
        int b=cxk.nextInt();
        int c=cxk.nextInt();
        if(a+b>c && a+c>b && b+c>a)
        {
            System.out.println("可以构成三角形de");    
        }
        else 
        {
            System.out.println("无法完美构成三角形");    
        }
    }
}