C#: Print the natural numbers from n to 1

Last update on December 20 2024 12:43:11 (UTC/GMT +8 hours)

Write a program in C# Sharp to print numbers from n to 1 using recursion.

Visual Presentation:

Sample Solution:

C# Sharp Code:

using System;

// Class definition named 'RecExercise1'
class RecExercise1
{
    // Recursive method to print natural numbers from 'ctr' to 1
    static int printNatural(int ctr, int stval)
    {
        // Base case: If the counter becomes less than 1, return the starting value
        if (ctr < 1)
        {
            return stval;
        }

        Console.Write(" {0} ", ctr); // Print the current number
        ctr--; // Decrement the counter
        // Recursive call: Decrement 'ctr' and continue printing natural numbers
        return printNatural(ctr, stval);
    }

    // Main method, the entry point of the program
    static void Main()
    {
        // Display a description of the program
        Console.Write("\n\n Recursion : Print the natural numbers from n to 1 :\n");
        Console.Write("--------------------------------------------------------\n");
        Console.Write(" How many numbers to print : ");
        int ctr = Convert.ToInt32(Console.ReadLine()); // Read the user input for the count of numbers

        // Call the recursive method to print natural numbers from 'ctr' to 1
        printNatural(ctr, 1);
        Console.Write("\n\n");
    }
}

Sample Output:

Recursion : Print the natural numbers from n to 1 :                                                          
--------------------------------------------------------                                                      
 How many numbers to print : 20                                                                               
 20  19  18  17  16  15  14  13  12  11  10  9  8  7  6  5  4  3  2  1 

Flowchart :

C# Sharp Code Editor:

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