This program will help us calculate the letter frequency from a plain txt file.
g++ main.cpp LetterFrequency.cpp LetterFrequency.h
1. You'll need to provide the path for a .txt file (e.g filename.txt if in the same folder than the project)
./a.out filename.txt
./a.out testFile.txt
A. Run the program once to obtain the statistics for each letter
B. Open, modify the txt file by adding or deleting some letters, save the changes
C. Run the program again and check the statistics for your changes