create a calculator in csharp

main.cs
using System;

namespace CalculatorProgram
{
    class Program
    {
        static void Main(string[] args)
        {
            double result = 0.0;
            bool validInput = false;

            while (!validInput)
            {
                Console.WriteLine("Enter a basic arithmetic operation (+, -, *, /) or 'q' to quit:");
                string operation = Console.ReadLine();

                if (operation == "+" || operation == "-" || operation == "*" || operation == "/")
                {
                    Console.WriteLine("Enter the first operand:");
                    double num1 = Convert.ToDouble(Console.ReadLine());

                    Console.WriteLine("Enter the second operand:");
                    double num2 = Convert.ToDouble(Console.ReadLine());

                    if (operation == "+")
                    {
                        result = num1 + num2;
                        Console.WriteLine($"The result of {num1} + {num2} is {result}");
                    }
                    else if (operation == "-")
                    {
                        result = num1 - num2;
                        Console.WriteLine($"The result of {num1} - {num2} is {result}");
                    }
                    else if (operation == "*")
                    {
                        result = num1 * num2;
                        Console.WriteLine($"The result of {num1} * {num2} is {result}");
                    }
                    else if (operation == "/")
                    {
                        if (num2 == 0)
                        {
                            Console.WriteLine("Error: Cannot divide by zero");
                        }
                        else
                        {
                            result = num1 / num2;
                            Console.WriteLine($"The result of {num1} / {num2} is {result}");
                        }
                    }
                }
                else if (operation == "q")
                {
                    Console.WriteLine("Quitting calculator program...");
                    validInput = true;
                }
                else
                {
                    Console.WriteLine("Invalid input. Please enter a valid operation.");
                }
            }
        }
    }
}
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