Using C++ Task 1. File Filter: A file filter reads an input file, transforms it

Question

Using C++

Task 1. File Filter:

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 derived 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 the following member function:

void doFilter (ifstream &in, ofstream &out)

This function should be 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.

Task 2. File Double-Spacer:

Create a derived class of the abstract filter class of problem 1 that double-spaces a file: that is, it inserts a blank line between any two lines of the file.

Explanation / Answer

//  file filter program

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