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No idea what's going on there. If it mistook it for some other operator there'd be a syntax error since ? and : can't do much else, but it's definitely not working. Perhaps it's being taken to be...

Plus does not mean append, that's only a feature of std::string. What you are doing is adding a number to a number.

I don't think you need std::string at all. Just let cout print them:
cout <<...