User-submitted CPP Projects

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Recently I am considering about a small plan of a ticketmachine,well,it’s not a simple ticketmachine,I will gonna make it a test platform for many new functions. Here is how I suppose it will works
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a base calculator, using simple functional programming, active C++11 and be sure, it'll compile. i think i'll upload my OB programs in next few days too.
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Save a variable to a file between runs. This demo reads a number from a file, adds 1, and then saves it to the same file.
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