The point of this exercise is to see if you can
write a program which, using input.txt,
will produce output identical to expected_output.txt.
To be clear, this program is not meant to take actual user input. This program is only meant to read input.txt as simulated user input.
The time allowed for this exercise is 15 minutes. Please note that this is not a pass/fail exercise in terms of getting the program all the way finished. I don't expect you to finish the program in 15 minutes. The point of this exercise is just to see how you approach the problem.