Arithmetic Drill

December 31, 2010

Children just learning the basic facts of arithmetic need repetitious drill to certify their knowledge, something that a computer does well. Toy stores purvey many brightly-colored plastic boxes that do the job, at a price. Today’s exercise asks you to do the same, minus the plastic box. Consider the following dialog, where the computer’s output is in roman and the child’s response is in italic:

4 + 4 = 8
Right!
8 + 3 = 12
Wrong, try again!
8 + 3 = 11
Right!
9 + 4 = 13
Right!
7 + 8 = ?
15
9 + 5 = 14
Right!
8 + 0 = ^Z
Goodbye!

After the drill program presents a problem, the child either enters his answer, asks for help by entering a question mark, or quits by entering an end-of-file. Correct answers are rewarded, incorrect answers cause the problem to be asked again.

Your task is to write a program that drills children on their addition facts. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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