C program to calculate factorial of a number using recursion.

#include<stdio.h>

#include<conio.h>

void main(){

long int n,ans;

long int factorial(long int x);

printf("Enter an integer number\n");

scanf("%ld",&n);

ans=factorial(n);

printf("factorial of %ld=%ld\n",n,ans);

getch();

}

long int factorial(long int x){

if (x==1) return 1;

else return (x*factorial(x-1));

}