From:	jsc AT lds DOT co DOT uk
Newsgroups:	comp.os.msdos.djgpp
Subject:	Forming a float from 4 seperate bytes
Date:	Tue, 27 Jul 1999 18:37:16 GMT
Organization:	Deja.com - Share what you know. Learn what you don't.
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hello all, sorry for the post that isn't specifically related to DJGPP, but
it's the only C news group I'm on.

I'm writing an (old) 3DStudio4 file parser and found a problem in the way
that the vertex coordinates are listed. each floating point value is
represented by 4 bytes which I can access but can't combine to form the
original float.

Well, I sort of can. If I do it directly from the file and use

fread (&Xvalue,4,1,fp);

where fp is my file pointer, 4 = the sizeof(float) , 1 = I want to do this
once and Xvalue = the final float value I want to end up with, it works. I
don't know why - I just took it from a doc on the 3ds format. However I want
to unload the file to a buffer and then start parsing. I've done the reading
into the buffer, but now I don't know how to reform my float from the data, I
tried  taking the 4 values and &-ing them together, but that doesn't work as
the final value I'm after is a float and I get an operand error. Any ideas on
how to take 4 integers and form the float? I'm surre it's easy but I can't
get it to work. Thanks Chris  jsc AT lds DOT co DOT uk


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