JAVA第三周作业 3.20

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 one;

import java.util.Scanner;

public class Test01 {

    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 year = input.nextInt();
        if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
            System.out.println("是闰年");
        } 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 one;

import java.util.Scanner;

public class Test01 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入4位会员卡号");
        int kh = input.nextInt();
        int b = kh / 100 % 10;
        if (b % 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 one;

import java.util.Scanner;

public class Test01 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入x的值");
        double zhi = input.nextDouble();
        double y;
        if (zhi > 0) {
            y = zhi + 3;
            System.out.println("y的值为" + y);
        } else if (zhi < 0) {
            y = 2 * zhi - 1;
            System.out.println("y的值为" + y);
        } else {
            System.out.println("y的值为0");
        }

    }

}

 

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 one;

import java.util.Scanner;

public class Test01 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入3个数");
        double a = input.nextDouble();
        double b = input.nextDouble();
        double c = input.nextDouble();
        if (a > b && b > c && b + c > a) {
            System.out.println("能构成三角形");
        } else if (a > c && c > b && b + c > a) {
            System.out.println("能构成三角形");
        } else if (b > c && c > a && a + c > b) {
            System.out.println("能构成三角形");
        } else if (b > a && a > c && a + c > b) {
            System.out.println("能构成三角形");
        } else if (c > b && b > a && a + b > c) {
            System.out.println("能构成三角形");
        } else if (c > a && a > b && a + b > c) {
            System.out.println("能构成三角形");
        } else {
            System.out.println("不能构成三角形");
        }
    }

}