/* netgeek 2001-09-15 */

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

#define SNEAKERS 7

static char *colours[SNEAKERS] = {"red","orange","yellow","green","blue","khaki","black"};

static int set_sneakers (int date, int *sneakers);
static int output (int date, int *sneakers);
static int set_date (int argc, char **argv);
static int current_date (void);

int main (int argc, char **argv) {
  int date = set_date(argc, argv);
  int sneakers[2];
  
  (void)set_sneakers(date, sneakers);
  (void)output(date,sneakers);

  return 0;
}

int set_sneakers (int date, int *sneakers) {
  /* modifies sneakers */
  srand((unsigned int)date);

  sneakers[0] = (int)((SNEAKERS - 1.0) * rand() / RAND_MAX);
  sneakers[1] = (int)((SNEAKERS - 1.0) * rand() / RAND_MAX);
  if (sneakers[0] == sneakers[1]) {
    srand((unsigned int)(20.0 * rand()));
    sneakers[0] = (int)((SNEAKERS - 1.0) * rand() / RAND_MAX);
    sneakers[1] = (int)((SNEAKERS - 1.0) * rand() / RAND_MAX);
  }

  return 1;
}

int output (int date, int *sneakers) {
  (void)printf("Sneakers for %i: %s, %s\n",
   date,
   colours[sneakers[0]],
   colours[sneakers[1]]);

  return 1;
}

int set_date (int argc, char **argv) {
  if (argc > 1)
    return (int)strtod(argv[1],NULL);

  return current_date();
}

int current_date (void) {
  struct tm *date;
  time_t t = time(NULL);

  if (t != -1)
    if ((date = localtime(&t)) != NULL)
      return (((1900+date->tm_year)*10000)
       + ((1+date->tm_mon)*100)
       + date->tm_mday);

  return 0;
}