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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),
       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.   Relational  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  indicates  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, 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 .