hpux man page for isnan

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)