C++ Programming

Write an abstract file filter class that defines a pure virtua l function for transforming a character. Create one subclass of your file filter class that performs encryption , another that transforms a file to all uppercase, and another that creates an unchanged copy of the original file.

The class should have a member function void doFilter(ifstream &in, ofstream &out) that is called to perform the actual filtering.

The member function for transforming a single character should have the prototype char transform(char ch)

The encryption class should have a constructor that takes an integer as an argument and uses it as the encryption key, the encryption can be a simple adding one to each character if you wish.

include a FileFilter.h, EncryptionFilter.h, EncryptionFilter.cpp, UppercaseFilter.h, UppercaseFilter.cpp, UnchangedFilter.h, UnchangedFilter.cpp.