Console.Write("Enter a number: ");
double num1 = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter Operator: ");
string op = Console.ReadLine();
Console.Write("Enter a number: ");
double num2 = Convert.ToDouble(Console.ReadLine());
if (op == "+")
{
Console.WriteLine(num1 + num2);
} else if (op == "-"){
Console.WriteLine(num1 - num2);
} else if (op == "/")
{
Console.WriteLine(num1 / num2);
} else if (op == "*")
{
Console.WriteLine(num1 * num2);
} else
{
Console.WriteLine("Invalid Operator");
}
Console.ReadLine();