You may want to look at using something like bignum with one of the approaches below above. With numbers this large, I believe Perl will convert them into floating-point numbers, and so will lose accuracy.

The alternative is to handle the carry-out parts yourself, but that's hard, and is essentially what bignum does anyways.

Update: Oops, I misread the question; I thought you were adding two strings of hex digits, not adding up the hex pairs in one string. Thanks to ikegami and Roy Johnson for showing me the error of my ways. :)

In reply to Re: String adding by sgifford
in thread String adding by tim0304

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