simple gatya simulator

#define RARE_PROBABILITY 5
#define NUM_OF_RARE_CARD 6

int card[NUM_OF_RARE_CARD], i;

int is_complete(){
  for(i=0;i<NUM_OF_RARE_CARD;i++)
    if(!card[i])
      return 0;
  return 1;
}

main(){
  int n = 0, i, p;
  srand(time(0));

  while(!is_complete()){
    // congrats! you've got a rare card
    if((p =rand() % 100) < NUM_OF_RARE_CARD * RARE_PROBABILITY)
      card[p % NUM_OF_RARE_CARD]++;

    n++;
  }

  printf("%d\n", n); // print the number of tries
}