subtraction with complement by Curta Calculator

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Curta calculator adds 9999...999 when you subtract 1 from the given number. This number, 9999...999 is a 10's complement number of 1. This principle is also used in a modern electronic digital computers where it uses binary number and 2's complement.
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1st rotation - goes to 0
2nd rotaion - "error: stack overflow" :)
...

mihailstratan
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