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: John Stiles <email@hidden>
- Date: Thu, 21 Jul 2005 12:03:50 -0700
Any of these combinations should be sufficient.
What happens when you step through it in the debugger?
Ian was here wrote:
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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