PROGRAMMING - Hacking: The Art of Exploitation - page 109

j = i + 1;
while(j < 16) {
if(numbers[i] == numbers[j])
match = numbers[i];
j++;
}
}
if(match != -1) {
printf("The dealer matched the number %d!\n", match);
printf("You lose %d credits.\n", wager);
player.credits -= wager;
} else {
printf("There were no matches! You win %d credits!\n", wager);
player.credits += wager;
}
return 0;
}
// This is the Find the Ace game.
// It returns -1 if the player has 0 credits.
int find_the_ace() {
int i, ace, total_wager;
int invalid_choice, pick = -1, wager_one = -1, wager_two = -1;
char choice_two, cards[3] = {'X', 'X', 'X'};
ace = rand()%3; // Place the ace randomly.
printf("******* Find the Ace *******\n");
printf("In this game, you can wager up to all of your credits.\n");
printf("Three cards will be dealt out, two queens and one ace.\n");
printf("If you find the ace, you will win your wager.\n");
printf("After choosing a card, one of the queens will be revealed.\n");
printf("At this point, you may either select a different card or\n");
printf("increase your wager.\n\n");
if(player.credits == 0) {
printf("You don't have any credits to wager!\n\n");
return -1;
}
while(wager_one == -1) // Loop until valid wager is made.
wager_one = take_wager(player.credits, 0);
print_cards("Dealing cards", cards, -1);
pick = -1;
while((pick < 1) || (pick > 3)) { // Loop until valid pick is made.
printf("Select a card: 1, 2, or 3 ");
scanf("%d", &pick);
}
pick--; // Adjust the pick since card numbering starts at 0.
i=0;
while(i == ace || i == pick) // Keep looping until
i++; // we find a valid queen to reveal.
cards[i] = 'Q';
print_cards("Revealing a queen", cards, pick);