Mail Archives: djgpp/1992/08/06/11:06:48
Hello DJ,
> > (2) The pow(x,y) function crashes (Exception 117) on
> > negative x values, e.g. pow(-2,3).
> > Is this an old bug ?
> > (Note: the 'libsrc/m/exp.s' file in my distribution
> > was changed by 'roberto AT germinal DOT ibp DOT fr' on 03-Apr-1991)
>
> 117 is a floating point exception, as raising negative numbers in pow
> should be.
I do not totally agree with this, I'm afraid.
I don't have the 'official' C reference, but K&R (2nd ed.) state at p.251:
pow(x,y) x^y. A domain error occurs if x=0 and y<=0,
or if x<0 and y is not an integer.
I assume from this that 'pow(-2,3)' returns '-8', as is the case on
the HP system I'm also working on.
>
> 1.07 is the latest. See below for e-mail access.
>
I missed the e-mail 'below'. You don't mean 'dj AT ctron DOT com', do you ?
Thanks.
PS: should I revise 'exp.s' to make a contribution to your program ?
/-----------------------------------------------------------------------/
/ Name : Pieter Kunst /
/ Email: kunst AT prl DOT philips DOT nl /
/-----------------------------------------------------------------------/
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