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23match

This is a game called "23 matches". When it is your turn, you may take one, two, or three matches. The object of the game is not to have to take the last match. You play against the computer and who has to take the first turn is decided randomly.

Source code

// Copyright BASIC version - Creative Computing, Morristown, New Jersey
// Copyright Arena version - 2006 J.L. Bezemer

int enter () {
  return ((int) (fgets (stdin)));
}

int start (int m) {
  print ("This is a game called '23 matches'.\n\n");
  print ("When it is your turn, you may take one, two, or three\n");
  print ("matches. The object of the game is not to have to take\n");
  print ("the last match.\n\n");
  
  print ("Let's flip a coin to see who goes first.\n");
  print ("If it comes up heads, I will win the toss.\n\n");

  if (rand (0, RAND_MAX) & 1) {
    print ("Heads! I win! Ha! Ha!\n");
    print ("Prepare to lose, meatball-nose!!\n");
    print ("I take 2 matches\n");
    m -= 2;
  } else {
    print ("Tails! You go first.\n");
  }
  return (m);
}

bool move_not_ok (int a, int m) {
  if ((a > m) || (a > 3) || (a < 1)) {
     print ("Very funny! Dummy!\n"); 
     print ("Do you want to play or goof around?\n");
  }
  return ((a > m) || (a > 3) || (a < 1));
}

int user_moves (int m) {
  printf ("The number of matches is now %d\n", m);
  print ("Your turn -- you may take 1, 2 or 3 matches.\n");

  do {
    print ("How many do you wish to remove? "); a = enter (); 
  } while (move_not_ok (a, m));

  printf ("There are now %d matches remaining.\n", m - a);
  return (a);
}

bool user_wins (int m) {
  if (m < 2) {
    print ("\nYou won, floppy ears!\n");
    print ("Think you're pretty smart!\n"); 
    print ("Let's play again and I'll blow your shoes off!!\n");
  }
  return (m < 2);
}

int computer_moves (int m, int u) {
  c = m < 5 ? m - 1 : 4 - u;
  printf ("\nMy turn! I remove %d matches.\n", c);
  return (c);
}

bool computer_wins (int m) {
  if (m < 2) { 
    print ("You poor boob! You took the last match! I gotcha!!\n");
    print ("Ha! Ha! I beat you!!!\n");
    print ("Goodbye loser!\n");
  }
  return (m < 2);
}

void game (int m) {
  for (;;) {
    u = user_moves (m); m -= u;
    if (user_wins (m)) exit (0); 

    c = computer_moves (m, u); m -= c;
    if (computer_wins (m)) exit (0);
  }
}

void matches (int m) {
  m = start (m);
  game (m);
}

matches (23);