比如,运行程序后,用户输入数字3,则程序打印“31天”或“3月有31天”。
注意,满足如下两个条件之一的年份是闰年,闰年的2月有29天:
(1)能被4整除且不能被100整除的为闰年。(如2004年是,1900年不是);
(2)能被400整能除的是闰年。(如2000年是,1900年不是)。
//注:我的这个程序要求必须输入正确
import java.util.Scanner;
public class sy {
public static void main(String args[]) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入年份:");
int year = scanner.nextInt();
System.out.print("请输入月份:");
int mouth = scanner.nextInt();
if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) {
switch (mouth) {
case 1:
System.out.println("31天");
break;
case 2:
System.out.println("29天");
break;
case 3:
System.out.println("31天");
break;
case 4:
System.out.println("30天");
break;
case 5:
System.out.println("31天");
break;
case 6:
System.out.println("30天");
break;
case 7:
System.out.println("31天");
break;
case 8:
System.out.println("31天");
break;
case 9:
System.out.println("30天");
break;
case 10:
System.out.println("31天");
break;
case 11:
System.out.println("30天");
break;
case 12:
System.out.println("31天");
break;
default:
System.out.println("输入不正确!");
}
}else {
switch (mouth) {
case 1:
System.out.println("31天");
break;
case 2:
System.out.println("28天");
break;
case 3:
System.out.println("31天");
break;
case 4:
System.out.println("30天");
break;
case 5:
System.out.println("31天");
break;
case 6:
System.out.println("30天");
break;
case 7:
System.out.println("31天");
break;
case 8:
System.out.println("31天");
break;
case 9:
System.out.println("30天");
break;
case 10:
System.out.println("31天");
break;
case 11:
System.out.println("30天");
break;
case 12:
System.out.println("31天");
break;
default:
System.out.println("输入不正确!");
}
}
}
}