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

       isless - test if x is less than y

       #include <math.h>

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

       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  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.



       isgreater() , isgreaterequal() , islessequal() , islessgreater()  ,  isunordered()  ,  the
       Base Definitions volume of IEEE Std 1003.1-2001, <math.h>

       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					ISLESS(P)
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