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Info_Mac IV CD-ROM (Pacific HiTech Inc.)(August 1994).iso
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nan
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1994-04-25
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nan:
Syntax: nan ( )
Description:
Nan returns a NaN (Not a Number) according to IEEE-754. One
way to determine if a variable contains a NaN is to test it
against itself.
NaN == NaN
Should always return FALSE (0).
See Also: inf