Re: [Tinycc-devel] Tinycc issues

[Henrik Nordstrom]

On Tue, 15 Mar 2005, Dominic Mazzoni wrote:

> 1. NaN in floating-point constants:
>
>   It is sometimes appropriate for a user-defined numerical function to
>   return NaN.  Normally I do this by defining a constant in my code, like
>   this:
>
>     float NAN_FLOAT = (float)(0.0 / 0.0);

This is undefined. May be either a quiet NaN or a signalling NaN depending 
on the floating point implementation.

You should use the NAN macro if available.

Example (Linux):

#define _ISOC99_SOURCE
#include <math.h>

int main(int argc, char **argv)
{
    printf("%f\n", NAN);
}

If NAN is not defined (it's a macro) then the floating point 
implementation does not support quiet NaNs.

Regards
Henrik