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First off let me say I have pretty basic knowledge of C++ and I'm pretty much a beginner in general, but my guess is if you want to do this what you need to do is have a way to escape the loop.
For example if your menu is
1 - Add Game
2 - Remove Game
You need to have something like:
9 - Quit
Then you can have your do loop do something like
do {
stuff;
}
while ( userAnswer != 9);