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This can be a bad habit to develop. See Why is using namespace std bad practice?

This can be a bad habit to develop. See Why is using namespace std bad practice?

Using system commands like this can be risky. See Edward's answer here for more information.

Using system commands like this can be risky. See Edward's answer here for more information.

This review is already long, so I won't try to cover more. If you submit a new question as an iterative review, you could get more suggestions. In particular, I'd actually prefer to do this as a class so as not to pass pegs to every function. Someone else might have critiques of some of my suggestions.

This review is already long, so I won't try to cover more. If you submit a new question as an iterative review, you could get more suggestions. In particular, I'd actually prefer to do this as a class so as not to pass pegs to every function. Someone else might have critiques of some of my suggestions.