I enter in a 16 digit number and Excel turns the last digit to "O"

Giganews Newsgroups
Subject: I enter in a 16 digit number and Excel turns the last digit to "O"
Posted by:  G.Adamson (gadams…@marshallswift.com)
Date: Fri, 10 Oct 2003

Hello,
I have credit card numbers that I have entered into and
Excel spreadsheet (ex.  4444444444444444).  When I entere
this in excel changes the last digit to "0" (ex.
4444444444444440).  I am thinking that some sort
of "Masking" is going on?  How can I convert this back to
the original true cc #?

Thank you,
G. Adamson

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