Factrorial calculation In C

factorial_calc.c

#include <stdio.h>

unsigned long faktoriyel(int); //prototip tanımı
int main ()
{
	long deg1;
	deg1=faktoriyel(14);
	printf ("14!=%ld\n",deg1);
	return 0;
}

unsigned long faktoriyel (int n)
{
	long fktryl=1;
	while (n>1)
	{
		fktryl *=n;
		n--;
	}
	return fktryl;
}