A file filter reads an input file, transforms it in some way, and writes the results to an output file. Write an abstract file filter class that defines a pure virtual function for transforming a character. Create one subclass of your file filter class that performs encryption, another that transforms a file to all upper case, 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 c)

The encryption class should have a constructor that takes an integer as an argument and uses it as the encryption key.

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