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isnan(3M)							     isnan(3M)

NAME
       isnan() - floating-point test for NaN

SYNOPSIS
       floating-type

DESCRIPTION
       The  macro determines whether its argument is a NaN.  The argument must
       be of floating type.  For HP Integrity servers, the argument can be any
       floating type.  For PA-RISC, the argument must be either or

       The  macro  implements  the  functionality  recommended by the IEEE-754
       standard for floating-point arithmetic.

       The macro replaces the and functions, which are	obsolete  and  are  no
       longer supported.

USAGE
       To  use	the  macro, compile either with the default option or with the
       and options.  Make sure your program includes Link in the math  library
       by specifying on the compiler or linker command line.

RETURN VALUE
       The macro returns a nonzero value if and only if its argument has a NaN
       value.  The macro raises no floating-point exceptions.

ERRORS
       No errors are defined.

EXAMPLES
       Take certain actions if is not a NaN:

SEE ALSO
       fpclassify(3M),	isfinite(3M),  isinf(3M),  isnormal(3M),  signbit(3M),
       math(5).

STANDARDS CONFORMANCE
								     isnan(3M)

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