C#: Print the first n natural number

Last update on December 20 2024 12:52:18 (UTC/GMT +8 hours)

Write a program in C# Sharp to print the first n natural numbers using recursion.

Visual Presentation:

C# Sharp Exercises: Print the first n natural number

Sample Solution:

C# Sharp Code:

using System;

// Class definition named 'RecExercise1'
class RecExercise1
{
    // Recursive method to print the first 'ctr' natural numbers starting from 'stval'
    static int printNatural(int stval, int ctr)
    {
        // Base case: If the counter becomes less than 1, return the starting value
        if (ctr < 1)
        {
            return stval;
        }
        ctr--; // Decrement the counter
        Console.Write(" {0} ", stval); // Print the current value
        // Recursive call: Increment 'stval' and decrement 'ctr' to print the next natural number
        return printNatural(stval + 1, ctr);
    }

    // Main method, the entry point of the program
    static void Main()
    {
        // Display a description of the program
        Console.Write("\n\n Recursion : Print the first n natural number :\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 the first 'ctr' natural numbers starting from 1
        printNatural(1, ctr);
        Console.Write("\n\n");
    }
}

Sample Output:

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

Flowchart :

C# Sharp Code Editor:

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