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Re: [vox-tech] location of DBL_EPSILON definition
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Re: [vox-tech] location of DBL_EPSILON definition



Then you need to read IEEE 754 (and accompanying documents...):


http://grouper.ieee.org/groups/754/


Boris


Peter Jay Salzman wrote:
On Fri 26 Jan 07,  9:04 AM, Boris Jeremic <jeremic@ucdavis.edu> said:

on my machine (fedora core 5) there are definitions in

./usr/lib/gcc-lib/i386-redhat-linux/3.2.3/include/float.h

  /* Difference between 1.0 and the minimum double greater than 1.0 */
#undef DBL_EPSILON
#define DBL_EPSILON 2.2204460492503131e-16



but not in

./usr/lib/gcc/i386-redhat-linux/4.1.0/include/float.h

where it appears as:

/* The difference between 1 and the least value greater than 1 that is
  representable in the given floating point type, b**1-p.  */
#undef FLT_EPSILON
#undef DBL_EPSILON
#undef LDBL_EPSILON
#define FLT_EPSILON	__FLT_EPSILON__
#define DBL_EPSILON	__DBL_EPSILON__
#define LDBL_EPSILON	__LDBL_EPSILON__

It's in neither place for me.

You can also calculate them yourself:

Yeah, I'm aware of that, but this is not what I wanted.

It's not DBL_EPSILON that I care about (I simplified my question).  I wanted
a file that I could look at and know any of the constants that are of
interest to me.  It's not one constant I wanted to know, but all of them, in
one place.
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