第二次jave作业

1.判断闰年

import java.util.*;
public class One {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.println("请输入一个年份:");
         long year = input.nextLong();                               
         if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
                System.out.println(year + "是闰年！");
         } else {
                System.out.println(year + "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.

import java.util.*;
public class One {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.println("请输入卡号:");
         long hykh = input.nextLong();   
        if (hykh>999&&hykh<9999) {
            if (hykh%1000/100%3==0) {
                System.out.println("宁是辛运会员");
            }else {
                System.out.println("您八是幸运会员");
            }
        }else {
            System.out.println("请输入4位卡号");
        }
     }
}

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 )

import java.util.*;
public class One {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.println("x:");
         int x = input.nextInt();   
         if (x>0) {
            System.out.println("y="+(x+3));
        }else if (x<0) {
            System.out.println("y="+(x*2-1));
        }else {
            System.out.println("y=0");
        }

     }
}

 4.输入三个数判断是否能构成三角形

import java.util.*;
public class One {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.println("输入三位数");
         int x = input.nextInt();  
         int y = input.nextInt();  
         int z = input.nextInt(); 
         if (x+y>z&&x+z>y&&y+z>x) {
            System.out.println("可以构成三角形");
        }else {
            System.out.println("不！");
        }