Multiplicar si no es cero Ejercicio C# - Curso de Programación C# (C Sharp)

using System; // Importing the System namespace to use Console functionalities

class Program
{
    // Main method where the program execution begins
    static void Main()
    {
        int firstNumber;  // Declaring a variable to store the first number entered by the user
        int secondNumber; // Declaring a variable to store the second number entered by the user

        // Asking the user to enter the first number and reading the input
        Console.Write("Enter a number: ");
        firstNumber = Convert.ToInt32(Console.ReadLine()); // Converting the input to an integer

        // Checking if the first number is not zero
        if (firstNumber != 0) // If the first number is not zero
        {
            // Asking the user to enter the second number and reading the input
            Console.Write("Enter a second number: ");
            secondNumber = Convert.ToInt32(Console.ReadLine()); // Converting the input to an integer

            // Displaying the sum of the two numbers
            Console.WriteLine("The sum is: {0}", firstNumber + secondNumber); // Printing the sum
        }
        else // If the first number is zero
        {
            // Displaying "0" if the first number is zero
            Console.WriteLine("0"); // Printing "0"
        }
    }
}