Programming Horror

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Welcome to Programming Horror!

This is a place to share strange or terrible code you come across.

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submitted 2 years ago* (last edited 2 years ago) by [email protected] to c/[email protected]

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[–] [email protected] 22 points 2 years ago* (last edited 2 years ago) (2 children)

who needs modulo when you can get less characters out of

while (number > 1) {
  number -= 2;
}
return number;

very efficient

edit: or theres the trusty iseven api

[–] [email protected] 9 points 2 years ago (2 children)

here is somewhat less:

return (number % 2) == 0;

[–] [email protected] 11 points 2 years ago (1 children)

return !(number & 1);

[–] [email protected] 9 points 2 years ago* (last edited 2 years ago) (1 children)

This is the way. Modulo takes too long to compute, bitwise compare should be a lot faster.

return !(number &amp; 0x1);

[–] [email protected] 6 points 2 years ago* (last edited 2 years ago)

oh shit yo

this comment chain is pretty awesome, I learned a lot from this thanks!

[–] [email protected] 4 points 2 years ago

just check the last bit jesus christ, what is it with these expensive modulo operations?!

return !(n&1);

[–] [email protected] 2 points 2 years ago (1 children)

are the negative numbers all even?

[–] [email protected] 2 points 2 years ago

Yes