[EMAIL PROTECTED] wrote:
> i was wondering if someone could give me a hand on how to test the last
> number ie.
Try this:
For all the bits in the number, add together the last digit of the
decimal value that that bit represents. Do this again with the resulting
number until you have a value < 10. That's your last digit.
Example:
128 64 32 16 8 4 2 1
-------------------------------
0 1 1 1 0 1 0 1 == 117
Add 4 + 2 + 6 + 4 + 1 == 17
0 0 0 1 0 0 0 1 == 17
Add 6 + 1 == 7
Hey presto, you've got your number.
Of course, you'll have to test whether that's really faster than doing a
plain old 'x % 10'.
Matthew
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