c++ help!

hi, i really need some help with a program if anyone wants to! i'm in an intro class my prof gives us this programs to do and yet doesnt talk about them at all in class.

http://www.swt.edu/~hd01/1318/inclassexamples/switch_fun_object.cpp

this is the program. all i have to do is add 6 different shapes/objects to it and find the volume and surface area. can anyone help me? thank you soooooo much!!!