isless(3p) - phpMan

ISLESS(P)                                                            ISLESS(P)



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 sec-
       ond 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 excep-
       tion 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>

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 .



POSIX                                2003                            ISLESS(P)

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