利用循环结构实现的计算器

package com.yupei.constract.test;

import java.util.Scanner;

public class caculate {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

       String next;
        do {
            System.out.println("请输入数字来进行运算吧！");
            double m = scanner.nextFloat();    //获取第一个数字
            String x = scanner.next();        //获取加减乘除符号
            double n = scanner.nextDouble();   // 获取第二个数字
            double result;                      //存储运算结果

            switch (x) {
                case "+":
                    result = m + n;
                    System.out.println("加法运算的结果是:" + result);
                    break;
                case "-":
                    result = m - n;
                    System.out.println("减法运算的结果是：" + result);
                    break;

                case "*":
                    result = m * n;
                    System.out.println("乘法运算的结果是：" + result);
                    break;
                case "/":
                    if (n == 0) {
                        System.out.println("除数不能为0");
                    } else {
                        result = m / n;
                        System.out.println("除法运算的结果是：" + result);
                    }
                    break;

                default:
                    System.out.println("您输入的内容不合法");
            }
            System.out.println("是否要重新开始运算，请输入yes/no");
        next = scanner.next();
        } while (next.equals("yes"));
        System.out.println("感谢您的使用");

    }
}