On Tue, 2006-04-25 at 09:22 -0700, jshayden wrote:
> Using the c18 libraries, does anyone have an example of using the math
> functions in math.h.  I'm am getting trash output.  I thought it returned
> IEEE floating point, but it doesn't appear to.  Not even the sign bit is
> correct.  Here is a basic example I've tried working with.
> 
> #include <p18f4680.h>
> #include <math.h>
> 
> void main(void)
> {
> 	
> float_t x = 3.14;
> float_t z;
> 
> z = cos(x);
> 	
> }
> 
> 
> z's output is as follows...
> 00110110 11010110 11111011 00010110
> ...which is nowhere close to -1.

What do you expect to see for -1 ?   In a floating point format I would
expect to see something representing -0.5 * 2^1   (2^1 being 2 raised to
the power 1).

Peter



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