Give Change - C# Programming Exercise

using System;  // Import the System namespace, which contains fundamental classes like Console

class Program  // Define the Program class
{
    static void Main()  // The entry point of the program
    {
        // Ask the user for the price of the item
        Console.Write("Price? ");
        int price = int.Parse(Console.ReadLine());  // Read and convert the price to an integer

        // Ask the user for the amount paid
        Console.Write("Paid? ");
        int paid = int.Parse(Console.ReadLine());  // Read and convert the paid amount to an integer

        // Calculate the change to be returned
        int change = paid - price;  // Subtract the price from the paid amount to calculate the change

        // Display the total change to be returned
        Console.WriteLine($"Your change is {change}:");

        // Define an array of available coin and bill denominations
        int[] denominations = { 100, 50, 20, 10, 5, 2, 1 };  // Coins and bills in descending order

        // Iterate through the denominations array
        foreach (int denomination in denominations)  
        {
            // Calculate how many coins/bills of this denomination can be given as change
            while (change >= denomination)  
            {
                Console.Write(denomination + " ");  // Display the current denomination
                change -= denomination;  // Subtract the denomination from the remaining change
            }
        }

        // Print a newline after displaying the change
        Console.WriteLine();
    }
}