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I already found interesting answers in other questions to this topic. Yet, I still don't get it well enough to use it. Can someone please show it with an example? I won't tell you mine, because it's a homework and I really want to understand it myself.

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    _Especially_ when it is homework, it is important that you show some work of your own. Just stating "I won't tell you mine" is not going to cut it.2012-01-22
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    Also, I think that when you write "character" you mean "digit".2012-01-22
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    @Henning: Thanks for stating what you are missing. I have no idea at all. If you ask someone to add 2 numbers without explaining how to add, what can he show then? The only thing I could do was researching the internet. I did and showed some research results. Sorry, couldn't deliver more.2012-01-22
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    And I will post my result, when I understood it and calculated the result, okay?2012-01-22

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