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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 dif-
       fer (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 argu-
       ment. The value of islessequal( x, y) shall be equal to (x) <= (y); however, unlike (x) <= (y), islessequal( 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.  Rela-
       tional  operators may 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 NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section,  real-floating  indi-
       cates that the argument shall be an expression 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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)