Rewrite the Desks program from Exercise 7, passing all variables as reference variables and changing all the function return types to void. Save the file as Desks2.cpp.

Exercise 7:

Write a program that calculates the cost of building a desk. The main()function calls four other functions. Pass all variables so that the functions make copies of any variables they receive:

» A function to accept as input from the keyboard the number of drawers in the desk. This function returns the number of drawers to the main program.

» A function to accept as input the type of wood—‘m’ for mahogany, ‘o’ for oak, or ‘p’ for pine.

» A function that receives the drawer number and wood type, and calculates the cost of the desk based on the following:

Pine desks are $100.

Oak desks are $140.

All other woods are $180.

A $30 surcharge is added for each drawer.

This function returns the cost to the main()function.

» A function to display the final price. Save the file as Desks.cpp.