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void upr(const string & str)
First, if I called this function, how would I get back the converted string? You don't return a new string, and the argument you're passing cannot be changed (since it...

Look at the exercise in general terms.

What if you had an array of numbers, and I told you to add 1 to each number? How would you do it?

All you're doing is taking an array of whatever, and...