Question: I ' m trying to make a lower case letter to an upper case letter in C + + . I need to use the

I'm trying to make a lower case letter to an upper case letter in C++. I need to use the toupper function. I have a list of choices: (A, B, C, or D) and the if the user inputs "a" I need the program to understand they mean choice "A" so they can get the correct result because right now when I input "a" I get "invalid" but if I input "A" I get my correct result.

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