stopping_game.c

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

#define LEN 10

bool play() {

  int numbers[LEN];
  bool chosens[LEN];
  int max_index = 0;

  for (int i = 0; i < LEN; i++) {
    numbers[i] = rand();
    if (numbers[i] > numbers[max_index])
      max_index = i;
    chosens[i] = false;
  }

  int tries = rand() % LEN + 1;

  int last_option;

  for (int i = 0; i < tries; i++) {
    last_option = rand() % LEN;
    chosens[last_option] = true;
  }
  return (last_option == max_index);
}

int main() {

  FILE *fp = fopen("/dev/urandom", "r");
  int true_random;
  fread(&true_random, sizeof(int), 1, fp);
  srand(true_random);

  for (int j = 0; j < 100; j++) {
    int wins = 0;
    int plays = 0;
    for (int i = 0; i < 1000; i++) {
      if (play())
        wins++;
      plays++;
    }
    printf("%f\n", ((double)wins / (double)plays) * 100);
  }

  return 0;
}