Program in C++

Attach all header, source and driver files separately to your submission in eLearning

A file filter reads an input file, transforms it in some way, and writes the results to an output file. For this assignment, you will three different file filters.

Create an abstract file filter class that defines a pure virtual function for transforming a character.

The pure virtual function should have the following header

void doFilter(ifstream &in, ofstream &out)

All three derived classes will define this function

This function will handle the file filtering duties

Create three classes all derived from the abstract class. File filter 1 - EncryptionHas a single member variable named key

The key will be used to modify the ascii value of a character

It may be a positive or negative number

Has an overloaded constructor that takes an integer value and stores it in the key

The default key value is 5

Define the doFilter function to read each character from a file, convert the characters and write the characters to another file

Add the key value to the ASCII value of each character

The resulting number should be between 32 and 126. If the value is outside this range rollover the number.

For example if the number is 127 that rolls over to 32, 128 is 33, 129 is 34, etc.

Same applies for numbers below 32. 31 is 126, 30 is 125 etc.

File filter 2 - Uppercase

Create a function with the following header:

char transform(char ch)

Check if a letter is lowercase

If the letter is lowercase, convert it to uppercase

do not use the character functions from Chapter 10.

Define the doFilter function to read each character from a file, convert the characters to uppercase (if not already) and write the characters to another file

File filter 3 - Copy

Define the doFilter function to read each character from a file and write the characters (unmodified) to another file

Create a driver program that tests each class.

Other than the encryption class there should be no attributes, constructors or destructors. The main thing here is to redefine the pure virtual function.