On Aug 10, 2014, at 6:31 AM, Dave <d...@looktowindward.com> wrote:
> I just got caught out by the C/Objective-C Implementation of the % (mod)
> function in XCode C/Objective-C. I remember having this very same problem
> years ago (after I solved it again this time).
>
> It stems from the modulus (%) function not returning a true modulus for
> negative numbers - it returns the remainder not the modulus.
>
>
> I fixed it easily enough by writing my own mod function as so:
>
> -(NSInteger) modulusWithDividend:(NSInteger) theDividend
> andDivisor:(NSInteger) theDivisor
> {
> NSInteger myDividend;
>
> myDividend = theDividend % theDivisor;
> if (myDividend < 0)
> myDividend = myDividend + theDivisor;
>
> return myDividend;
> }
>
> (there is also a C function for it).
>
> ——————
>
> My question is, is there an inbuilt function/method I can use instead of
> wring my own?
I don't think so, although I would expect a C lib somewhere to address it.
Anyway, isn't easier to just always abs(x)%y?
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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