compute first 1000 hamming numbers

hamming.c

/*
 * Program to compute the first 1000 Hamming numbers.
 * i.e. numbers of the form 3**i4**j5**k.
 * Challenge from programming Praxis:
 * http://programmingpraxis.com/2011/08/30/hamming-numbers/
 */

#include <stdio.h>
#include <stdlib.h>

#define MAX 1000

void hamming_number(int n, int current_mult) {
  if (n < MAX) {
    printf("%d\n", n);
  }
  else {
    return;
  }
  switch (current_mult) {
    case 2 : hamming_number(n*current_mult, 2);
    case 3 : hamming_number(n*current_mult, 3);
    case 5 : hamming_number(n*current_mult, 5);
  }
}

int main(int argc, const char *argv[]) {
  hamming_number(1,2);
  return 0;
}