zj-Exercise/java-Eclipse/day05/SwitchCaseExer.java.bak

/*
从键盘分别输入年、月、日，判断这一天是当年的第几天
判断一年是否是闰年的标准：
（1）、可以被4整除，但是不能被100整除
或
（2）、可以被400整除

*/

import java.util.Scanner;
class SwitchCaseExer{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		System.out.println("请输入年份：");
		int year = scan.nextInt();
		System.out.println("请输入月份：");
		int month = scan.nextInt();
		System.out.println("请输入日期：");
		int day = scan.nextInt();

		//定义一个变量来保存总天数
		int sumDays = 0;

		switch(month){
			case 12:
				sumDays += 30;
			case 11:
				sumDays += 31;
			case 10:
				sumDays += 30;
			case 9:
				sumDays += 31;
			case 8:
				sumDays += 31;
			case 7:
				sumDays += 30;
			case 6:
				sumDays += 31;
			case 5:
				sumDays += 30;
			case 4:
				sumDays += 31;
			case 3:
				//sumDays += 28;
				//判断year是否是闰年
				if(year%4 == 0 && year%100 !=0 || year%400 ==0){
					sumDays += 29;
				}else{
					sumDays += 28;
				}
			case 2:
				sumDays += 31;
			case 1:
				sumDays += day;
		}
		System.out.println("2019年"+month+"月"+day+"日是当年的第"+sumDays+"天");
		
	}
}