Arithmetic

## Description

Arithmetic is an arithmetic quiz application. The game will ask a sequence of
arithmetic questions, and will continue with each correct answer. If an answer
is entered incorrectly, the game will remain on that question until the
correct answer is entered. After each 20 questions, the game will report your
score so far.

The game will initially only ask addition and subtraction questions, but
multiplication and division questions can be enabled by using command-line
parameters.

Arithmetic