Use the program in Ch. 7 of Beginning Visual C 2012 on p. 292 as a starting point for this the program in the following ways: Add a third box to the calculation. Initialize length (L), width (W), and height (H) for the third box. Calculate the total volume for all three boxes in question. Answer the following questions in your own words after making the required modifications to the program: Under what circumstances must you use classes? Why do you use a class instead of a structure? Are they interchangeable? Explain your answer. Are classes more useful than structures? Why or why not? ANSWER:

o Under what circumstances must you use classes?

We use classes in C to define our own structure types and optionally create instantiations...