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

PROLOG
       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.
NAME
       islessequal - test if x is less than or equal to y
SYNOPSIS
       #include <math.h>
       int islessequal(real-floating x, real-floating y);

DESCRIPTION
       The islessequal() macro shall determine whether its first  argument  is
       less than or equal to its second argument. The value of islessequal( x,
       y) shall be equal to (x) <= (y); however, unlike  (x) <= (y),  islesse-
       qual( x, y) shall not raise the invalid floating-point exception when x
       and y are unordered.
RETURN VALUE
       Upon successful completion, the islessequal() macro  shall  return  the
       value of (x) <= (y).
       If x or y is NaN, 0 shall be returned.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION 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 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.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       isgreater(),      isgreaterequal(),      isless(),     islessgreater(),
       isunordered(), the  Base  Definitions  volume  of  IEEE Std 1003.1-2001
       <math.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. 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 http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                      ISLESSEQUAL(3P)