need help on c++ program please

here's code:

The C++ classes VBase and VDerived that are shown on page 3 are also available on the WyoCourses site in the file Lab13.cpp (link on the assignment page). These two form a simple base and derived class pair. We begin with this program and investigate simple modifications and additions to it. 1. Construct a new Microsoft Visual Studio Win32 Console Application project with this file as the sole content. Build and run the program, verifying that the console output is simply Object(3) 2. Open a new text document (e.g. in Notepad, Lab13Test.txt) and generate a set of answers to the questions that follow. Question #1: The base class VBase is an "abstract" class. Why is this true? HINT: attempt to add the following code line to the body of main() VBase B and note the messages provided by the compiler. NOTE: remove this line after you try it