Graphics Programs Reference
In-Depth Information
invalid_choice = 1;
while(invalid_choice) { // Loop until valid choice is made.
printf("Would you like to:\n[c]hange your pick\tor\t[i]ncrease your wager?\n");
printf("Select c or i: ");
choice_two = '\n';
while(choice_two == '\n') // Flush extra newlines.
scanf("%c", &choice_two);
if(choice_two == 'i') { // Increase wager.
invalid_choice=0; // This is a valid choice.
while(wager_two == -1) // Loop until valid second wager is made.
wager_two = take_wager(player.credits, wager_one);
}
if(choice_two == 'c') { // Change pick.
i = invalid_choice = 0; // Valid choice
while(i == pick || cards[i] == 'Q') // Loop until the other card
i++; // is found,
pick = i; // and then swap pick.
printf("Your card pick has been changed to card %d\n", pick+1);
}
}
for(i=0; i < 3; i++) { // Reveal all of the cards.
if(ace == i)
cards[i] = 'A';
else
cards[i] = 'Q';
}
print_cards("End result", cards, pick);
if(pick == ace) { // Handle win.
printf("You have won %d credits from your first wager\n", wager_one);
player.credits += wager_one;
if(wager_two != -1) {
printf("and an additional %d credits from your second wager!\n", wager_two);
player.credits += wager_two;
}
} else { // Handle loss.
printf("You have lost %d credits from your first wager\n", wager_one);
player.credits -= wager_one;
if(wager_two != -1) {
printf("and an additional %d credits from your second wager!\n", wager_two);
player.credits -= wager_two;
}
}
return 0;
}
Since this is a multi-user program that writes to a file in the /var dir-
ectory, it must be suid root.
reader@hacking:~/booksrc $ gcc -o game_of_chance game_of_chance.c
reader@hacking:~/booksrc $ sudo chown root:root ./game_of_chance
reader@hacking:~/booksrc $ sudo chmod u+s ./game_of_chance
reader@hacking:~/booksrc $ ./game_of_chance
