using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace ConsoleApplication3

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine("第一個數：");

int a = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("輸入運算子（+—*/）");

// c=Console.ReadLine();

char str=Convert.ToChar(Console.ReadLine());

Console.WriteLine("第er個數：");

int b = Int32.Parse(Console.ReadLine());

//int c = a + b;

//Console.WriteLine("兩個數和為：{0}",c);

switch (str) {

case "+":

Console.WriteLine("兩個數和為：{0}", a+b);

break;

case "-":

Console.WriteLine("兩個數差為：{0}", a-b);

break;

case "*":

Console.WriteLine("兩個數積為：{0}", a*b);

break;

case "/":

Console.WriteLine("兩個數商為：{0}", a/b);

break;

case "%":

Console.WriteLine("兩個數餘數為：{0}", a % b);

break;

default:

Console.WriteLine("輸入正確的運算子！！");

break;

}

}

}

}