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

namespace DesignModel
{
   public class Program
    {
       public static void Main(string[] args)
        {
            #region  计算器

            try
            {
                Console.WriteLine("请输入数字A:");
                string NumberA = Console.ReadLine();
                Console.WriteLine("请选择运算(+ - * /)");
                string strOption = Console.ReadLine();
                  Console.WriteLine("请输入数字B:");
                string NumberB = Console.ReadLine();
                string Result = "";
                switch (strOption)
                {
                    case "+":
                        Result =Convert.ToString( Convert.ToInt32( NumberA )+ Convert.ToInt32( NumberB));
                        break;
                    case "-":
                        Result = Convert.ToString(Convert.ToInt32(NumberA) - Convert.ToInt32(NumberB));
                        break;
                    case "*":
                         Result = Convert.ToString(Convert.ToInt32(NumberA)* Convert.ToInt32(NumberB));
                        break;
                    case "/":
                        //三目运算
                      NumberB=  NumberB != "0" ? Result = Convert.ToString(Convert.ToInt32(NumberA) / Convert.ToInt32(NumberB)) : Result = "除数不能是0";

                        break;

                }
                Console.WriteLine("结果是:"+Result);
                Console.ReadLine();

            }
            catch (Exception ex)
            {

                Console.WriteLine(ex);
            }
            #endregion

        }
    }
}