Re: Strange issue when converting from hex to float
Re: Strange issue when converting from hex to float
- Subject: Re: Strange issue when converting from hex to float
- From: Ian was here <email@hidden>
- Date: Thu, 21 Jul 2005 11:52:22 -0700 (PDT)
I've tried several combos and they all yield a value
of zero.
float fAlpha = alphaComp / 255.0f;
float fAlpha = (float)alphaComp /
255.0f;
float fAlpha = alphaComp / 255.0;
Doesn't seem to want to do the division??
--- Dan Treiman <email@hidden> wrote:
> Dividing an long by long integer returns a long,
> thats the way the C
> compiler does it. And integer division truncates
> the result to an
> integer.
> Try casting one of your arguments as a float, that
> will force the
> compiler to generate floating point division
>
> i.e.
> float fAlpha = alphaComp / 255.0f;
>
> -DT.
>
> On Jul 21, 2005, at 11:54 AM, Ian was here wrote:
>
> > I have written a method that converts hex values
> to
> > floating point numbers. I am having a really
> strange
> > problem occur in the conversion process.
> >
> >
> >
> > // Convert each hex segment to decimal. This code
> > works fine!
> >
> > long alphaComp = strtol( alphaValue, NULL, 16 );
> > long redComp = strtol( redValue, NULL, 16 );
> > long greenComp = strtol( greenValue, NULL, 16 );
> > long blueComp = strtol( blueValue, NULL, 16 );
> >
> >
> >
> > The following code segment always returns zero!!??
>
> >
> > // Convert each decimal number to float.
> >
> > float fAlpha = alphaComp / 255L;
> > float fRed = alphaComp / 255L;
> > float fGreen = alphaComp / 255L;
> > float fBlue = alphaComp / 255L;
> >
> >
> > Any ideas would be greatly appreciated. Thank you.
> >
> >
> >
> >
> >
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