# Factorial Program In C Using Recursion Function With Explanation

Factorial Program In C Using Recursion Function With Explanation. If you are looking for a factorial program in C with recursion function example, this C programming tutorial will help you to learn how to find the factorial of a number. Just go through this C program to calculate factorial of a number, you will be able to write a factorial C program using recursion function.

## What is Factorial in Mathematics?

In mathematics, Factorial is the product of a positive number (n) and all the numbers below of it (n-1). Example, the factorial of positive number n is ( n! ) is equal to 1*2*3*…*n.

Example: What is the value of 5!

5! = 1*2*3*4*5 => 120

The value of 5! is 120.

### Factorial Program in C

Learn how to write a  C program for factorial. Writing a C program to find factorial can be done using various techniques like using for loop, while loop, pointers, recursion but here in this program, we show how to write a factorial program using for loop in a proper way.

## Factorial Program in C using Recursion

This factorial program in c using recursion function is the 12th C programming example in the series, it helps newbies who started coding, programming students and B.Tech graduates in enhancing their C programming skills and get a job in software industry.

All the best guys in learning c programs with coding compiler website. We wish all the success in your career. Happy Learning.

### Factorial Program in C using Recursion Function

Copy the below source code to find the factorial of a number using recursive function program or write your own logic by using this program as a reference. Paste the factorial program into C compilers and run the program to see the result.

```/* C PROGRAM FOR FACTORIAL USING RECURSION FUNCTION - FACTORIAL.C */

#include <stdio.h>
long int multiplyNumbers(int n);

int main()
{
int n; //variable declaration

printf("Enter a positive number: "); //asking user to enter number

scanf("%d", &n); //reading number from user

printf("Factorial of %d = %ld", n, multiplyNumbers(n));
return 0;
}

//Recursive function for finding factorial

long int multiplyNumbers(int n)
{
if (n >= 1)
return n*multiplyNumbers(n-1);
else
return 1;
}```

#### FACTORIAL program in c using recursion function OUTPUT

After you compile and run the above factorial program in c to find the factorial of a number using a recursive function, your C compiler asks you to enter a number to find factorial. After you enter your number, the program will be executed and give output like below expected output.

Output – 1

Enter a positive number: 5
Factorial of 5 = 120

##### FACTORIAL Program in C using Recursion with Explanation

In the above output user entered number 5 to find the factorial. Program execution will start from the beginning of the main() function. The main function consists of multiplyNumbers() recursive function, this multiplyNumbers() function is called from main() function with user entered number 5 as an argument.

After passing number 5 to the multiplyNumbers() function will call multiplyNumbers() function (recursive call). In recursive call, the value of that passed argument ‘n’ is decreased by 1 until n value reaches less than 1.

Once n value is less than one, there is no recursive call and the factorial program will calculate and print output. Factorial of 5 as 120.

### One thought on “Factorial Program In C Using Recursion Function With Explanation”

• February 5, 2018 at 8:01 pm