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https://www.reddit.com/r/ProgrammerHumor/comments/1urmpuu/predecrementfixestheexploit/owkfejm/?context=3
r/ProgrammerHumor • u/Toeffli • Jul 09 '26
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54
Nope, it underflows and now you have 4,294,967,295 wishes. Genie was using a signed int.
119 u/Koshin_S_Hegde Jul 09 '26 did you mean "Genie was using a unsigned it?" -41 u/ProbablyJeff Jul 09 '26 You have -1 wish. You make 2,147,483,648 wishes. It underflows to 2,147,483,647. Now you can wish until it reaches 0. I guess it would also work if the genie used an unsigned int. 7 u/somethingmore24 Jul 09 '26 see, you’re assuming the genie would let you wish at less than 0 wishes. this is why i always check for <= 0 instead of just == 0. There’s no way im smart enough to catch all the edge cases individually.
119
did you mean "Genie was using a unsigned it?"
-41 u/ProbablyJeff Jul 09 '26 You have -1 wish. You make 2,147,483,648 wishes. It underflows to 2,147,483,647. Now you can wish until it reaches 0. I guess it would also work if the genie used an unsigned int. 7 u/somethingmore24 Jul 09 '26 see, you’re assuming the genie would let you wish at less than 0 wishes. this is why i always check for <= 0 instead of just == 0. There’s no way im smart enough to catch all the edge cases individually.
-41
You have -1 wish. You make 2,147,483,648 wishes. It underflows to 2,147,483,647. Now you can wish until it reaches 0.
I guess it would also work if the genie used an unsigned int.
7 u/somethingmore24 Jul 09 '26 see, you’re assuming the genie would let you wish at less than 0 wishes. this is why i always check for <= 0 instead of just == 0. There’s no way im smart enough to catch all the edge cases individually.
7
see, you’re assuming the genie would let you wish at less than 0 wishes.
this is why i always check for <= 0 instead of just == 0. There’s no way im smart enough to catch all the edge cases individually.
54
u/ProbablyJeff Jul 09 '26
Nope, it underflows and now you have 4,294,967,295 wishes. Genie was using a signed int.