factorial using recursion

/*program to find factorial using recursion*/

#include <stdio.h>
#include<conio.h>
int factorial(int n)
{
    if (n == 0 || n == 1)
	  return 1;
    else
        return n * factorial(n - 1);
}

int main()
{
    int num;
    printf("Enter a non-negative integer: ");
    scanf("%d", &num);
	if (num < 0)
        printf("Factorial is not defined for negative numbers.\n");
    else
	{
        int result = factorial(num);
        printf("Factorial of %d is: %d\n", num, result);
    }
	getch();
	return 0;
}