What will be the output of the following C++ code?

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main ()
{
    char str[] = "ffff";
    long int number;
    if (isxdigit(str[0]))
    {
        number = strtol (str, NULL, 16);
        printf ("%ld\n", number);
    }
    return 0;
}