Puzzle of the Week #5: C'ing is believing

puzzle5.c

#include <stdio.h>

/* Run like this:
 *   gcc -Wall -Wextra puzzle5.c && ./a.out
 */

/* TODO: remove these weird unused functions */
long int g(long int x) {
    return x;
}

typedef long int (*int_to_int)(long int);
int_to_int f(long int x) {
    (void) x; /* unused */
    return g;
}

/* Some "convenience" macros for "field" offsets */
#define ALPHA(f) ((long int) f + 0)
#define BETA (f) ((long int) f + 1)
#define GAMMA(f) ((long int) f + 2)

int main(int argc, char **argv)
{
    long int values[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    long int field = 3;

    (void) argc; /* unused */
    (void) argv; /* unused */
    printf("%ld, %ld, %ld\n",
           values[ALPHA(field)],
           values[BETA(field)],
           values[GAMMA(field)]);
}