isgreater man page on Archlinux

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

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

       #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 ||
	      _POSIX_C_SOURCE >= 200112L;
	      or cc -std=c99

       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 the macros listed below.

       These macros are guaranteed to evaluate their arguments only once.  The
       arguments must be of real floating-point type (note: do not pass	 inte‐
       ger  values  as arguments to these macros, since the arguments will not
       be promoted to real-floating types).

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

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

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

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

	      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.

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

       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.

       No errors occur.

   Multithreading (see pthreads(7))
       The isgreater(),	 isgreaterequal(),  isless(),  islessequal(),  isless‐
       greater(), and isunordered() macros are thread-safe.

       C99, POSIX.1-2001.

       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.

       fpclassify(3), isnan(3)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

				  2014-01-27			  ISGREATER(3)

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