Console.Title = "加减乘除";

double x, y,z=0;

string m;

int n=0;

Console.WriteLine("第一个数：");

x = Convert.ToDouble(Console.ReadLine());

Console.WriteLine("运算符(默认为加)：");

m =Console.ReadLine();

m = (m == "加" || m == "+") ? "加" : (m == "减" || m == "-") ? "减" : (m == "乘" || m == "*"||m=="×") ? "乘" : (m == "除" || m == "/"||m=="÷") ? "除":"加" ;

Console.WriteLine("进行的是" + m + "法运算");

Console.WriteLine("第二个数：");

y = Convert.ToDouble(Console.ReadLine());

switch (m)

{

case "加":

z = x + y;

break;

case "减":

z = x - y;

break;

case "乘":

z = x * y;

break;

case "除":

z = x / y;

break;

default:

z = x + y;

break;

}

Console.WriteLine("运算结果是"+z);

Console.ReadKey();