课后作业二

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = 0;
            int m = 0;
            int result = 0;
            string sign;

            Console.WriteLine("请输入一个数：");
            n = int.Parse(Console.ReadLine());
            Console.WriteLine("再输入一个数: ");
            m = int.Parse(Console.ReadLine());
            Console.WriteLine("请输入运算符号：");
            sign = Console.ReadLine();
            switch (sign)
            {
                case "+":
                    result = n + m;
                    break;
                case "-":
                    result = n - m;
                    break;
                case "*":
                    result = n * m;
                    break;
                case "/":
                    result = n / m;
                    break;
            }
            Console.WriteLine("结果是：" + result.ToString());


            Console.ReadKey();


        }



    }
}