pwnable.kr —— blackjack

question#

Hey! check out this C implementation of blackjack game!
I found it online
* http://cboard.cprogramming.com/c-programming/114023-simple-blackjack-program.html

I like to give my flags to millionares.
how much money you got?


Running at : nc pwnable.kr 9009

analyse#

int betting() //Asks user amount to bet
{
 printf("\n\nEnter Bet: $");
 scanf("%d", &bet);
 
 if (bet > cash) //If player tries to bet more money than player has
 {
        printf("\nYou cannot bet more money than you have.");
        printf("\nEnter Bet: ");
        scanf("%d", &bet);
        return bet;
 }
 else return bet;
} // End Function

可以看到当输入bet后，会与cash比较，数了以后cash=cash-bet
那么输入一个大的负数，并且输掉应该就可以了

get flag#

输入bet：-100000000，然后选择Stay输掉，再进入下一场即可获得flag

flag：YaY_I_AM_A_MILLIONARE_LOL