bạn bè mình nó ở ngoài kia nó học trên lớp, tối về nó coi tivi chơi , nó làm bài tập , học bài mới , là cuối kì nó thi vèo vèo, còn mình thì ngày học ở lớp, về nhà mày mò tự học , tự cày , tự suy ngẫm , nghiên cứu, sao mà mình không thua được chứ , cái này tôi đã chịu đựng 2 năm qua rồi, thiệt ra nếu học hành đàng hoàng có lẽ giờ cũng ko đến nối nào (mà thực ra h cũng phơi phơi tuy không cao nhưng cũng đâu có bèo quá )
 

According to the statement, Kusznirewicz was playing an OLG slot machine called Buccaneer at Georgian Downs in Innisfil, Ont., on Dec. 8 when it showed he had won $42.9 million.

When the machine’s winning lights and sounds were activated, an OLG floor attendant initially told Kusznirewicz to go to the “winners circle” to claim his prize, according to the statement. But other OLG employees immediately arrived and told him that the corporation would not be paying, because there had been a “machine malfunction.”

They offered him a free dinner for four at the casino’s buffet.

In a press release, OLG described the malfunction as follows:

“The single Buccaneer-themed slot machine in question is a two cent per play machine with a base game reward of $300 and an absolute maximum payout of $9,025,” the release states.

“The $42 million figure is not a possible award given this machine’s configuration and pay table settings.”
 

Of course the lawsuit will probably be thrown out, or OLG will settle with the guy for a lesser amount. But from a technical perspective, it’s amusing to think about what happened to cause this scenario. You can imagine the slot machine software looking something like this:

void do_spin() {
spin_reels();
if (winning_combination) {
unsigned int winnings = calculate_payout_in_cents();
send_to_display("You've won $%u!\n", winnings/100);
add_to_balance(winnings/100);
}
}

int calculate_payout_in_cents() {
int rv;
if (rv = lookup_payout_amount())
return rv;
else
return -1;
}

For some reason, something caused lookup_payout_amount() to return NULL, which meant calculate_payout() returned -1, signifying an error. Then, in addition to implicitly casting the signed result to an unsigned type, do_spin() fails to check for the error condition! It assumes success and announces the payout via the slot machine’s display. In this case, the -1, represented as 0xFFFFFFFF in two’s complement, gets interpreted as an unsigned number, 4294967295, due to the implicit cast, and the display prints “You’ve won $42949672!”

 

Nếu mình nhớ không nhầm thì tác giả của BluePrint (#6) là một người Việt smilie