On Fri, 25 Feb 2000 13:52:58 +0100 (MET) [EMAIL PROTECTED] wrote:
> Thanks! In which file/header or whatever are such rules defined? I'd like
> to print it out in order to prevent such errors.
>
> I've even tried
> NumOfDays=(T2-T1)/(ULong)(24*3600)+1;
> but with the same (wrong) result. It seems that for a*b compiler takes
No then you should do:
NumOfDays=(T2-T1)/((ULong)24*(ULong)3600)+1;
because with the way you have it, by the time you cast it to ULong, the value has
already been truncated to 16-bits.
> sizeof(a), then sizeof(b) and result is truncated to
> Max{sizeof(a),sizeof(b)}.
> Is it matter of compiler or PalmOS or C in general?
>
> Rgds,
>
> -DR
>
>
> On Fri, 25 Feb 2000, Al Cilcius wrote:
>
> > The type of the result of (24 * 3600) is int. On PalmOS this is 16bits in
> > size. The result can not fit in 16bits so the high-order bits are
> truncated > leaving you with the lower 16bits which are 0x5180 ==
> 20864decimal. >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Danko Radic
> > Sent: Friday, February 25, 2000 3:52 AM
> > To: Palm Developer Forum
> > Subject: Little C or compiler question
> >
> >
> > (CW R5 + 2 patches, Win95)
> >
> > I have:
> >
> > ULong T1,T2,NumOfDays;
> >
> > Why does:
> >
> > NumOfDays=(T2-T1)/86400+1;
> >
> > give correct result and
> >
> > NumOfDays=(T2-T1)/(24*3600)+1;
> >
> > doesn't?
> > T1, T2 are times in seconds, and when they differ for 1.999 days, 1st
> > operation gives correct NumOfDays=2, but 2nd gives result NumOfDays=9.
> > If it is automatic casting problem, where can I find these rules?
> >
> > Rgds,
> >
> > -DR
> >
> >
> > --
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> >
> >
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>
>
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