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Linux 2.6 - man page for islessequal (linux section 3posix)

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

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); how-
       ever,  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 SYN-
       OPSIS  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				   ISLESSEQUAL(P)


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