Day02Homework

import java.util.Scanner;

/**
 * 判断季度
 * 根据用户输入的月份值,判断该月属于那个季度;
 */
public class Test01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int month = scanner.nextInt();
        System.out.println("请输入月份");
        switch (month){
            case 1:
            case 2:
            case 3:
                System.out.println("第一季度");
                break;
            case 4:
            case 5:
            case 6:
                System.out.println("第二季度");
                break;
            case 7:
            case 8:
            case 9:
                System.out.println("第三季度");
                break;
            case 10:
            case 11:
            case 12:
                System.out.println("第四季度");
                break;
            default:
                System.out.println("输入错误");
        }
    }
}

import java.util.Scanner;

/**
 *数位求和
 * 任意一个四位整数,计算各数位上的数字之和并输出
 */
public class Test02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一个四位整数");
        int n = scanner.nextInt();
        int sum=0;
        while(n>0){
            sum += n%10;
            n/=10;
        }
        System.out.println(sum);
    }
}

import java.util.Scanner;

/**
 * 数位求和升级版
 */
public class Test03 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int index;
        do {
           index =-1;
            System.out.println("请输入数字:");
            int  n =scanner.nextInt();
            int sum = 0;
            while (n > 0) {
                sum += n % 10;
                n /= 10;
            }
            System.out.println("各位数字之和是"+sum);
            System.out.println("是否继续?(y/n)");
            String s = scanner.next();
            if (s.equals("y")){
                index=1;
            }else if (s.equals("n")){
                index =2;
                System.out.println("程序退出");
            }else{
                index =3;
                System.out.println("输入有误,请重新输入");
            }
        }while (index!=2);

        }
    }