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 threehomework;
import java.util.Scanner;
public class text1 {
    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 threehomework;
import java.util.Scanner;
public class text1 {
        public static void main(String[] args) {
            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 )
        x*2 –1 ( x < 0 )

package threehomework;
import java.util.Scanner;
public class text1 {
        public static void main(String[] args) {
            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 threehomework;
import java.util.Scanner;
public class text1 {
        public static void main(String[] args) {
            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");
            }
        }
    }