第三次作业

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 huaerzi;
import java.util.Scanner;
public class huada {
    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");
        int nian=input.nextInt();
        if(nian%4==0&&nian%100!=0||nian%400==0){
            System.out.println("闰年");
        }else{
            System.out.println("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 huaerzi;
import java.util.Scanner;
public class huada {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
         Scanner input =new Scanner(System.in);
            System.out.println("请输入卡号");
            int a=input.nextInt();
            if(a%1000/100==0){
                System.out.println("幸运会员");
            }else{
                System.out.println("不是幸运会员");
        }
    }
}

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 huaerzi;
import java.util.Scanner;
public class huada {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
         Scanner input =new Scanner(System.in);
            System.out.println("请输入");
            int x=input.nextInt();
            if(x>0){
                int y=x+3;
                System.out.println(y);
            }else if(x==0){
                int y=0;
                System.out.println(y);
            }else{
                int y=x*2-1;
                System.out.println(y);
        }
    }
}

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 huaerzi;
import java.util.Scanner;
public class huada {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner input =new Scanner(System.in);
        System.out.println("请输入");
        int a=input.nextInt();
        int b=input.nextInt();
        int c=input.nextInt();
        int d=a+b;
        int e=a+c;
        int f=b+c;
        if(d>c&&e>b&&f>a){
            System.out.println("可以");
        }else{
            System.out.println("不可以");
        }
    }
}