Write the program in the following ways:

Write the program in the following ways:

• Add a third box to the calculation.
• Calculate 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?