Dev - C++ - ayuda por favor

#include <stdio.h>

#include <conio.h>

int n;

long fact();

main()

{

    long factorial = 0;

    printf(">> CALCULANDO FACTORIAL <<\n");

    printf("Digite un numero: ");

    scanf("%d", &n);

    factorial = fact();

    printf("El factorial es: %ld", factorial);

    getch();

    return 0;

}

long fact()

{

    long r = 1;

    for (int i = 1; i <= n; i++)

        r *= i;

    return r;

}