trusty (3) isless.3posix.gz

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NAME
       isless - test if x is less than y


SYNOPSIS
       #include <math.h>

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


DESCRIPTION
       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.


RETURN VALUE
       Upon successful completion, the isless() 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() , 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
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .