4 Function Calculator

CopyConsole.Write("Enter num1: ");
double num1 = Convert.ToDouble(Console.ReadLine());

Console.Write("Enter operator: ");
string op = Console.ReadLine();

Console.Write("Enter num2: ");
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");
}

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