VIP29/JavaSe01/day03/src/main/java/Exer03.java

import java.util.Scanner;

/**
 * ClassName: Exer02
 * Package: PACKAGE_NAME
 * Description:
 *
 * @Author 爱扣钉-陈晨
 * @Create 2023/9/17 10:33
 * @Version 1.0
 */
public class Exer03 {

    /*
    Exer02>
    switch中case具有穿透性,不遇到break不会停止.会向下执行.

    编写程序：
    从键盘上输入2023年的“month”和“day”，
    要求通过程序输出输入的日期为2023年的第几天。
        day = 10
        ==1 day
        ==2 + 31 + day
        ==3 + 31 + 28 + day
        ....
        ==12 + 31 + 28 + 31 + 30 + 31 ..... + day

         case 穿透性
        days = 0;

        case 12:
            days+=31;
        case 11:
            days+=30;

            ....
        case 1:
            days+= day;
     */
    public static void main(String[] args) {
        //键盘输入
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入月份");
        //月份
        int month = scanner.nextInt();
        System.out.println("请输入天数");
        //天数
        int day = scanner.nextInt();

        //求和
        int days = 0 ;

        switch (month){
            case 12:
                days += 30;
            case 11:
                days += 31;
            case 10:
                days += 30;
            case 9:
                days += 31;
            case 8:
                days += 31;
            case 7:
                days += 30;
            case 6:
                days += 31;
            case 5:
                days += 30;
            case 4:
                days += 31;
            case 3:
                days += 28;
            case 2:
                days += 31;
            case 1:
                days += day;
        }

        System.out.println("2023年"+month+"月"+day+"天:是2023年的第"+days+"天");
    }
}