C#: To find the factorial of a given number

Last update on August 25 2025 12:47:19 (UTC/GMT +8 hours)

Write a program in C# Sharp to create a recursive function to find the factorial of a given number.

Visual Presentation:

C# Sharp Exercises: Function : To find the factorial of a given number

Sample Solution:

C# Sharp Code:

using System;

// Class definition named 'funcexer11'
class funcexer11
{
    // Main method, the entry point of the program
    static void Main()
    {
        decimal f;

        // Display a description of the program
        Console.Write("\n\nRecursive Function : To find the factorial of a given number :\n");
        Console.Write("------------------------------------------------------------------\n");

        // Prompt the user to input a number
        Console.Write("Input a number : ");
        int num = Convert.ToInt32(Console.ReadLine());

        // Call the 'Factorial' method to calculate the factorial of the input number
        f = Factorial(num);

        // Display the factorial of the input number
        Console.WriteLine("The factorial of {0}! is  {1}", num, f);
    }

    // Recursive method to calculate the factorial of a number
    static decimal Factorial(int n1)
    {
        // The base case of the recursion: factorial of 0 is 1
        if (n1 == 0)
        {
            return 1;
        }
        // Recursive call: the method calls itself to calculate factorial
        else
        {
            return n1 * Factorial(n1 - 1);
        }
    }
}

Sample Output:

Recursive Function : To find the factorial of a given number :                                                
------------------------------------------------------------------                                            
Input a number : 5                                                                                            
The factorial of 5! is  120

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