Div. AA. simulator.

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

#define MAX_TRIALS 1024

typedef struct {
  int cas;
  double aa;
  int cas_killed;
} stats_t;

int simulate_aa(stats_t *stats);

int main(const int argc, const char **argv) {

  if (argc < 3) exit(-1);
  srand(time(NULL));

  register stats_t *stats = malloc(sizeof(stats_t));
  stats->aa = atof(argv[2]);
  int sim_total_kc = 0;

  for (int i = 0; i < MAX_TRIALS; ++i) {
    stats->cas = atoi(argv[1]);
    stats->cas_killed = 0;

    int cas_attacks = 0;
    int aa_attacks = 0;

    while (cas_attacks < 10) { // modifiable trial condition.
      printf("Day %d, %d:00 | Total kills: %d.\n", cas_attacks / 3, 8 * (cas_attacks % 3), stats->cas_killed);
      ++cas_attacks;
      if (rand() % 100 <= 6) {
        ++aa_attacks;
        // simulate_aa(stats);
        printf("Day %d, %d:00 | Shot down %d planes.\n", cas_attacks / 3, 8 * (cas_attacks % 3), simulate_aa(stats));
      }
    }
    sim_total_kc += stats->cas_killed;
  }

  printf("Finished.  avg. %d CAS shot down with %f air attack.\n\n", sim_total_kc / MAX_TRIALS, stats->aa);
  free(stats);
  return 0;
}

int simulate_aa(stats_t *stats) {

  int aa_kills = stats->cas * (fmod(rand(), 5 * stats->aa + 1) / 1000);
  int kills = aa_kills >= 1 ? aa_kills : 1;
  stats->cas_killed += kills;
  stats->cas -= kills;
  return kills;
}