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ieeeck examples
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Man Page Details
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NAME
       IEEECK  -  called  from the ILAENV to verify that Infinity and possibly
       NaN arithmetic is safe (i.e

SYNOPSIS
       INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE )

           INTEGER      ISPEC

           REAL         ONE, ZERO

  Purpose
  =======

  IEEECK is called from the ILAENV to verify that Infinity and
  possibly NaN arithmetic is safe (i.e. will not trap).

  Arguments
  =========

  ISPEC   (input) INTEGER
          Specifies whether to test just for inifinity arithmetic
          or whether to test for infinity and NaN arithmetic.
          = 0: Verify infinity arithmetic only.
          = 1: Verify infinity and NaN arithmetic.

  ZERO    (input) REAL
          Must contain the value 0.0
          This is passed to prevent the compiler from optimizing
          away this code.

  ONE     (input) REAL
          Must contain the value 1.0
          This is passed to prevent the compiler from optimizing
          away this code.

  RETURN VALUE:  INTEGER
          = 0:  Arithmetic failed to produce the correct answers
          = 1:  Arithmetic produced the correct answers

