C recursion function - Factorial Number Example

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The functions in C are recursive which means that they can call themselves. The act of self reference is known as recursion. The function that contains itself and call itself is called recursive function. Sometimes, the recursive function is also known as tail recursion.

C Recursion function - General Form:

 recursiveFunction(){
   //other statements
   recursiveFunction();
 }

C Recursion function - Example

Let us understand the recursive function from the following example program:

#include<stdio.h>


int factorial(int m);
void main()
{
	int n, s;

	printf( "Enter input value:");
	scanf("%d",&n);
	s = factorial(n);
	printf("\nThe result is: %d",s);
	getch();
}

int factorial(int n)
{
	int result;
	if(n < 0)
	  return -1;
	if(n == 0)
	  return 1;
	result = n * factorial(n - 1);
	return(result);
}

Output:

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