opensolaris man page for isless

isless(3M)						  Mathematical Library Functions						isless(3M)

NAME
       isless - test if x is less than y

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       int isless(real-floating x, real-floating y);

DESCRIPTION
       The  isless()  macro  determines  whether its first argument is less than its second argument.  The value of isless(x, y) is equal to (x) <
       (y); however, unlike (x) < (y), isless(x, y) does not raise the invalid floating-point exception when x and y are unordered.

RETURN VALUES
       Upon successful completion, the isless() macro returns the value of (x) < (y).

       If x or y is NaN, 0 is returned.

ERRORS
       No errors are defined.

USAGE
       The relational and equality operators support the usual mathematical relationships between numeric values. For any ordered pair of  numeric
       values,	exactly  one  of  the  relationships (less, greater, and equal) is true. Relational operators can raise the invalid floating-point
       exception when argument values are NaNs. For a NaN and a numeric value, or for two NaNs, just the  unordered  relationship  is  true.  This
       macro  is  a  quiet  (non-floating-point  exception  raising)  version of a relational operator. It facilitates writing efficient code that
       accounts for quiet NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section, real-floating indicates  that  the
       argument is an expression of real-floating type.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       isgreater(3M), isgreaterequal(3M), islessequal(3M), islessgreater(3M), isunordered(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							isless(3M)