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Yes, loops are basics of basics. You need them in order to repeat something.
Any book that intends a student to use goto (or explicitly says so) is a sign of a bad book. So I'd say go ahead.

First off, don't use goto. It causes spagetti code, as you can see, very hard to read. You should learn how to use loops.
Now, as for the problem, it's basically a symptom of using std::getline...