C#: Find the factorial of a given number

Last update on August 25 2025 12:54:21 (UTC/GMT +8 hours)

Write a program in C# Sharp to find the factorial of a given number using recursion.

Visual Presentation:

C# Sharp Exercises: Find the factorial of a given number

Sample Solution:

C# Sharp Code:

using System;

class RecExercise9
{
    // Main method: entry point of the program
    static void Main(string[] args)
    {
        Console.WriteLine("\n\n Recursion : Find the factorial of a given number :");
        Console.WriteLine("-------------------------------------------------------");

        // Accept user input for the number
        Console.Write(" Input any positive number : ");
        int n1 = Convert.ToInt32(Console.ReadLine());

        // Call the FactorialCalcu method and store the result in 'fact'
        long fact = FactorialCalcu(n1);

        // Display the factorial of the input number
        Console.WriteLine(" The factorial of {0} is : {1} ", n1, fact);

        Console.ReadKey(); // Wait for a key press to exit
    }

    // Recursive method to calculate factorial of a number
    private static long FactorialCalcu(int n1)
    {
        // Base case: if n1 is 0, return 1 (base factorial condition)
        if (n1 == 0)
        {
            return 1;
        }
        // Recursive call: Multiply n1 with factorial of n1-1 until reaching the base case
        return n1 * FactorialCalcu(n1 - 1);
    }
}

Sample Output:

 Recursion : Find the factorial of a given number :                                                           
-------------------------------------------------------                                                       
 Input any positive number : 8                                                                                
 The factorial of 8 is : 40320

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