Find the Factorial of a Number by using Tail Recursive Method

/*
Write a program to find the factorial of a number by tail recursive method.
*/

#include<stdio.h>

long TailRecursiveFact(int n);
long TRfact(int n, int result);

main()
{

 int num;
 
 printf("Enter a number : ");
 
 scanf("%d", &num);

 if(num<0)
 
 printf("No factorial for negative number\n");
 
 printf("Factorial of %d is %ld\n", num, TailRecursiveFact(num) );
}


/*Tail recursive*/
long TRfact(int n, int result)

{
 
 if( n==0)
 
 return result;
 
 return TRfact(n-1, n*result);
}


/*Helper function*/
long TailRecursiveFact(int n)
{

 return TRfact(n, 1);

}