Exceptions V2 C# Exercise - C# Programming Course

using System;  // Import the System namespace for basic functionality

class Program  // Define the main class
{
    static void Main()  // The entry point of the program
    {
        try
        {
            // Ask the user to enter a real number
            Console.Write("Enter a real number: ");
            double number = Convert.ToDouble(Console.ReadLine());  // Convert the input to a double

            // Check if the number is negative before attempting to calculate the square root
            if (number < 0)
            {
                // If the number is negative, throw an exception as we can't calculate the square root of a negative number
                throw new InvalidOperationException("Cannot calculate the square root of a negative number.");
            }

            // Calculate and display the square root of the number
            double squareRoot = Math.Sqrt(number);
            Console.WriteLine($"The square root of {number} is {squareRoot}");
        }
        catch (FormatException)
        {
            // Catch the FormatException if the user doesn't input a valid number
            Console.WriteLine("Error: Please enter a valid real number.");
        }
        catch (InvalidOperationException ex)
        {
            // Catch the InvalidOperationException if the number is negative
            Console.WriteLine(ex.Message);
        }
        catch (Exception ex)
        {
            // Catch any other unexpected exceptions
            Console.WriteLine($"An unexpected error occurred: {ex.Message}");
        }
    }
}