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isinf(3M)							     isinf(3M)

NAME
       isinf() - floating-point test for infinity

SYNOPSIS
DESCRIPTION
       The macro determines whether its argument is an infinity.  The argument
       must be of floating type, and classification is based on	 the  type  of
       the argument.  For HP Integrity servers, the argument can be any float‐
       ing type.  For PA-RISC, the argument must be either or

       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 x is Otherwise, it returns zero.
       The macro raises no floating-point exceptions.

ERRORS
       No errors are defined.

EXAMPLES
       Take certain actions if is infinity:

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

STANDARDS CONFORMANCE
								     isinf(3M)

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