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Linux 2.6 - man page for huge_vall (linux section 3)

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INFINITY(3)			    Linux Programmer's Manual			      INFINITY(3)

NAME
       INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants

SYNOPSIS
       #define _ISOC99_SOURCE	   /* See feature_test_macros(7) */
       #include <math.h>

       INFINITY

       NAN

       HUGE_VAL
       HUGE_VALF
       HUGE_VALL

DESCRIPTION
       The macro INFINITY expands to a float constant representing positive infinity.

       The  macro  NAN	expands to a float constant representing a quiet NaN (when supported).	A
       quiet NaN is a NaN ("not-a-number") that does not raise exceptions  when  it  is  used  in
       arithmetic.  The opposite is a signaling NaN.  See IEC 60559:1989.

       The  macros  HUGE_VAL, HUGE_VALF, HUGE_VALL expand to constants of types double, float and
       long double, respectively, that represent a large positive value, possibly plus infinity.

CONFORMING TO
       C99.

AVAILABILITY
       On a glibc system, the macro HUGE_VAL is always available.  Availability of the NAN  macro
       can  be	tested	using #ifdef NAN, and similarly for INFINITY, HUGE_VALF, HUGE_VALL.  They
       will be defined by <math.h> if _ISOC99_SOURCE or _GNU_SOURCE is	defined,  or  __STDC_VER-
       SION__ is defined and has a value not less than 199901L.

SEE ALSO
       fpclassify(3), math_error(7)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

					    2007-07-26				      INFINITY(3)
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