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

NAME
       isgreater,    isgreaterequal,   isless,	 islessequal,	islessgreater,
       isunordered - floating-point relational tests without exception for NaN

SYNOPSIS
       #include <math.h>

       int isgreater(x, y);

       int isgreaterequal(x, y);

       int isless(x, y);

       int islessequal(x, y);

       int islessgreater(x, y);

       int isunordered(x, y);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       All functions described here: _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE;
       or cc -std=c99

DESCRIPTION
       The  normal  relation operations (like <, "less than") will fail if one
       of the operands is NaN.	This will cause an exception.  To avoid	 this,
       C99  defines these macros.  The macros are guaranteed to evaluate their
       operands only once.  The operands can be	 of  any  real	floating-point
       type.

       isgreater()
	      determines (x) > (y) without an exception if x or y is NaN.

       isgreaterequal()
	      determines (x) >= (y) without an exception if x or y is NaN.

       isless()
	      determines (x) < (y) without an exception if x or y is NaN.

       islessequal()
	      determines (x) <= (y) without an exception if x or y is NaN.

       islessgreater()
	      determines (x) < (y) || (x) > (y) without an exception if x or y
	      is NaN.  This macro is not equivalent  to	 x != y	 because  that
	      expression is true if x or y is NaN.

       isunordered()
	      determines whether its arguments are unordered, that is, whether
	      at least one of the arguments is a NaN.

RETURN VALUE
       The macros other than isunordered() return the result of the relational
       comparison; these macros return 0 if either argument is a NaN.

       isunordered() returns 1 if x or y is NaN and 0 otherwise.

ERRORS
       No errors occur.

CONFORMING TO
       C99, POSIX.1-2001.

NOTES
       Not  all	 hardware supports these functions, and where hardware support
       isn't provided, they will be emulated by macros.	 This will result in a
       performance penalty.  Don't use these functions if NaN is of no concern
       for you.

SEE ALSO
       fpclassify(3), isnan(3)

COLOPHON
       This page is part of release 3.15 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/.

				  2008-08-05			  ISGREATER(3)
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