2020.3.23 java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 java_test;
import java.util.Scanner;
public class test_3 {

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

}

 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 java_test;
import java.util.Scanner;
public class test_3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个四位数的会员卡号");
        int number = input.nextInt();
        int bai = number % 1000 / 100 ;
        if (bai % 3 == 0) {
            System.out.println("您是幸运会员");
        }else {
            System.out.println("您不是幸运会员");
        }
    }

}

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 ) x2 –1 ( x < 0 )

package java_test;
import java.util.Scanner;
public class test_3 {

    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X的值");
        int X = input.nextInt();
        if (X>0) {
            System.out.println("y=" + (X+3));
        }else if (X==0) {
            System.out.println("y=" + 0);
        }else if (X<0) {
            System.out.println("y=" + (2*X-1));
        }else {
            System.out.println("无结果");
        }
    }
}

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 java_test;
import java.util.Scanner;
public class test_3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入第一个数");
        int a = input.nextInt();
        System.out.println("请输入第二个数");
        int b = input.nextInt();
        System.out.println("请输入第三个数");
        int c = input.nextInt();
        if (a+b>c && b+c>a && a+c>b) {
            System.out.println("这三位数可构成三角形");
        }else {
            System.out.println("这三个数不可构成三角形");
        }
    }
}