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ISLESS(3P)		   POSIX Programmer's Manual		    ISLESS(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       isless — test if x is less than y

       #include <math.h>

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

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

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

       Upon successful completion, the isless() macro shall return  the	 value
       of (x) < (y).

       If x or y is NaN, 0 shall be returned.

       No errors are defined.

       The following sections are informative.


       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 may raise the invalid floating-point	excep‐
       tion  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  NaNs
       without suffering the invalid floating-point exception. In the SYNOPSIS
       section, real-floating indicates that the argument shall be an  expres‐
       sion of real-floating type.



       isgreater(),    isgreaterequal(),    islessequal(),    islessgreater(),

       The Base Definitions volume of POSIX.1‐2008, <math.h>

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐ .

IEEE/The Open Group		     2013			    ISLESS(3P)

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