Write a C program to calculate factorial using recursion

Calculate factorial using recursion


Write a C program to calculate factorial using recursion. Here’s a Simple Program to find factorial of a number using recursive methods in C Programming Language.

This Program prompts user for entering any integer number, finds the factorial of input number and displays the output on screen.


Factorial of a Number : :


A factorial of a number x is defined as the product of x and all positive integers below x.  A factorial is product of all the number from 1 to the user specified number.

The factorial of a positive number n is given by ::


factorial of n (n!) = 1*2*3*4….n


The factorial of a negative number doesn’t exist. And the factorial of 0 is 1. You will learn to find the factorial of a number using recursion method in this example.

 Using Recursion : :


We will use a recursive user defined function to perform the task. Here we have a function fact( )  that calls itself in a recursive manner to find out the factorial of input number.

Below is the source code for C program to calculate factorial using recursion which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/* C program to calculate factorial using recursion */

#include<stdio.h>

long int fact(int n);

int main( )
{
	int num;
	printf("Enter any number :: ");
	scanf("%d", &num);

	printf("\nUsing Recursion ---> \n");
	if(num<0)
		printf("\nError! No factorial for negative number...\n");
	else
		printf("\nFactorial of [ %d! ] is :: %ld\n", num, fact(num) );

		return 0;
}/*End of main()*/

/*Recursive*/
long int fact(int n)
{
	if(n == 0)
		return(1);

	return(n * fact(n-1));
}/*End of fact()*/


OUTPUT  : :


/* C program to calculate factorial using recursion */

Enter any number :: 7

Using Recursion --->

Factorial of [ 7! ] is :: 5040

Process returned 0

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