- infile.dat
 - printfile.cpp printing file contents on screen
 Mikhail Nesterenko
 10/30/2015
 - printFileExtr.cpp using extraction operator to print file contents on screen
 Mikhail Nesterenko
 2/25/2016
 - setw.cpp setw usage
 Mikhail Nesterenko
 3/3/2014
 - sumthree.cpp Reads three numbers from the file infile.dat, sums the numbers, 
 and writes the sum to the file outfile.dat.
 Walt Savitch
 03/14/00
 - sumthree2.cpp reads three numbers from the file infile.dat, sums the numbers, 
 and writes the sum to the file outfile.dat.
 checks if file is opened successfully
 Walt Savitch 
 03/14/00
 - sumthree3.cpp Reads three numbers from the file specified by the user, sums the 
 numbers, and writes the sum to another file specified by the user.
 mixes console I/O and file I/O
 Walt Savitch
 03/14/00