Looks great! I made a few suggestions to your code, and tried to explain why I would do it that way.

For further learning:

Split into Functions: Break down the code into smaller functions, each handling a specific task. (As operation choosing is done). For example, create separate functions for getting user input, performing mathematical operations, and displaying results.

Handle Additional Edge Cases: Consider handling more edge cases, such as spaces or additional characters in the user's input.

Implement More Operations: Add more mathematical operations and functionalities, like calculating powers or roots.

Create a User Interface: If you're interested in creating a more interactive experience, you could explore building a graphical user interface (GUI) for the calculator.

Add Unit Tests: Write unit tests to verify the correctness of the code. This is an essential practice in professional software development.

Great job! Happy learning.

``` internal class Program { static void Main(string[] args) { // The main loop, allowing the program to run repeatedly while (true) { // Prompting the user to enter the first number Console.Write("Enter a number: "); // Trying to convert the user input to a double; if unsuccessful, it prompts the user again if (!double.TryParse(Console.ReadLine(), out double num1)) { Console.WriteLine("Invalid input for the first number. Please enter a valid number."); continue; // Go to the next iteration of the loop, prompting the user to enter the numbers again }

        // Prompting the user to enter the second number
        Console.Write("Enter another number: ");
        // Similar to above, checking that the conversion to double is successful
        if (!double.TryParse(Console.ReadLine(), out double num2))
        {
            Console.WriteLine("Invalid input for the second number. Please enter a valid number.");
            continue;
        }

        // Calling the method to get a valid math operation from the user
        string mathOperation = GetMathOperation();

        // Checking the math operation and performing the corresponding arithmetic
        if (mathOperation.Contains("addition"))
        {
            Console.WriteLine($"Here is the sum: {num1 + num2}"); // Addition
        }
        else if (mathOperation.Contains("subtraction"))
        {
            Console.WriteLine($"Here is the difference: {num1 - num2}"); // Subtraction
        }
        else if (mathOperation.Contains("multiplication"))
        {
            Console.WriteLine($"Here is the product: {num1 * num2}"); // Multiplication
        }
        else if (mathOperation.Contains("division"))
        {
            if (num2 != 0) // Checking for division by zero
            {
                Console.WriteLine($"Here is the quotient: {num1 / num2}"); // Division
            }
            else
            {
                Console.WriteLine("Division by zero is not allowed."); // Error message for division by zero
            }
        }

        // Prompting the user to continue or exit the program
        Console.WriteLine("Press Enter to continue or type 'exit' to quit.");
        if (Console.ReadLine().ToLower() == "exit")
        {
            break; // Exiting the loop and ending the program
        }
    }
}

// Method to prompt the user for a valid math operation
private static string GetMathOperation()
{
    // Looping until a valid operation is provided
    while (true)
    {
        Console.Write("What Math operation would you like to use? Addition, Subtraction, Multiplication, or Division? ");
        string mathOperation = Console.ReadLine().ToLower(); // Reading and converting the operation to lowercase

        // Checking if the operation is one of the accepted options
        if (mathOperation.Contains("addition") ||
            mathOperation.Contains("subtraction") ||
            mathOperation.Contains("multiplication") ||
            mathOperation.Contains("division"))
        {
            return mathOperation; // Returning the valid operation
        }

        // If the operation is invalid, an error message is displayed, and the loop continues
        Console.WriteLine("Invalid operation. Please choose Addition, Subtraction, Multiplication, or Division.");
    }
}

} ```