public static void Slove(string x, string y, string operation)
{
double a;
double b;
if (CalculatorHelper.CheckNumCondition(x) && CalculatorHelper.CheckNumCondition(y))
{
double.TryParse(x, out a);
double.TryParse(y, out b);
switch (operation)
{
case "M":
Console.WriteLine(a * b);
break;
case "D":
Console.WriteLine(a / b);
break;
case "A":
Console.WriteLine(a - b);
break;
case "S":
Console.WriteLine(a + b);
break;
default:
Console.WriteLine("error");
break;
}
}
else
{
Console.WriteLine("error");
}
}
