Repetitive Structures - C# Programming Exercise

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

class Program
{
    // Main method where the program execution begins
    static void Main()
    {
        // Prompt the user to enter the first number
        Console.Write("Enter the first number: ");
        int firstNumber = int.Parse(Console.ReadLine());  // Reading the first number entered by the user

        // Prompt the user to enter the last number
        Console.Write("Enter the last number: ");
        int lastNumber = int.Parse(Console.ReadLine());  // Reading the last number entered by the user

        // Using a for loop to display numbers from firstNumber to lastNumber
        Console.WriteLine("Using for loop:");
        for (int i = firstNumber; i <= lastNumber; i++)  // Loop runs from firstNumber to lastNumber
        {
            Console.Write(i + " ");  // Display the current number
        }
        Console.WriteLine();  // Move to the next line after printing the numbers

        // Using a while loop to display numbers from firstNumber to lastNumber
        Console.WriteLine("Using while loop:");
        int j = firstNumber;  // Initialize the counter for the while loop
        while (j <= lastNumber)  // Loop runs while j is less than or equal to lastNumber
        {
            Console.Write(j + " ");  // Display the current number
            j++;  // Increment the counter
        }
        Console.WriteLine();  // Move to the next line after printing the numbers

        // Using a do-while loop to display numbers from firstNumber to lastNumber
        Console.WriteLine("Using do-while loop:");
        int k = firstNumber;  // Initialize the counter for the do-while loop
        do
        {
            Console.Write(k + " ");  // Display the current number
            k++;  // Increment the counter
        }
        while (k <= lastNumber);  // Loop continues while k is less than or equal to lastNumber
        Console.WriteLine();  // Move to the next line after printing the numbers
    }
}