05-15-2014
Moderator's Comments:
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This is a very interesting problem, but:
1. it has nothing to do with UNIX or UNIX tools. It is just an algorithmic challenge. This wouldn't be so bad on itself, but see below.
2. You claimed that this is not homework and you are doing it just out of interest. Still, in this case you would have at least undertaken some thinking on how to solve it and presented them here along with the problem statement. What is the point in trying to solve puzzles if your only genuine contribution is to ask other people to solve it for you?
3. If this would have at least a remote real-world impact you would have limited the tools - languages, platforms, ... in some way. that you didn't reinforces my point that is problem was not posed upon you by yourself but by outside request - homework, take-home question in a job interview or the like - to be precise. It would be understandable for a professor/possibly hiring company/... to test your algorithmic skills by not limiting to any platform or language environment, but it is highly unlikely for you not to have any personal preference at all. For what is worth, you would have to understand the solution once it is presented to you and this is possible only with a language at least remotely known by you. What would you have done would anyone have written and posted a program in FORTH, APL2, ALGOL68 or another outlandish language, hm?
As long as you can't disprove my suspicion i close this thread for most probably being homework. Open a thread in the homework forum with the correct identification necessary there.
All the others: please refrain from providing solutions to dubious (albeit concededly interesting) problems. We have a "homework rule" in place for a reason and we do not want to encourage anybody breaking it.
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bakunin
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LEARN ABOUT DEBIAN
arithmetic
ARITHMETIC(6) BSD Games Manual ARITHMETIC(6)
NAME
arithmetic -- quiz on simple arithmetic
SYNOPSIS
arithmetic [-o +-x/] [-r range]
DESCRIPTION
arithmetic asks you to solve problems in simple arithmetic. Each question must be answered correctly before going on to the next. After
every 20 problems, it prints the score so far and the time taken. You can quit at any time by typing the interrupt or end-of-file character.
The options are as follows:
-o By default, arithmetic asks questions on addition of numbers from 0 to 10, and corresponding subtraction. By supplying one or more
of the characters +-x/, you can ask for problems in addition, subtraction, multiplication, and division, respectively. If you give
one of these characters more than once, that kind of problem will be asked correspondingly more often.
-r If a range is supplied, arithmetic selects the numbers in its problems in the following way. For addition and multiplication, the
numbers to be added or multiplied are between 0 and range, inclusive. For subtraction and division, both the required result and the
number to divide by or subtract will be between 0 and range. (Of course, arithmetic will not ask you to divide by 0.) The default
range is 10.
When you get a problem wrong, arithmetic will remember the numbers involved, and will tend to select those numbers more often than others, in
problems of the same sort. Eventually it will forgive and forget.
arithmetic cannot be persuaded to tell you the right answer. You must work it out for yourself.
DIAGNOSTICS
``What?'' if you get a question wrong. ``Right!'' if you get it right. ``Please type a number.'' if arithmetic doesn't understand what you
typed.
SEE ALSO
bc(1), dc(1)
BSD
May 31, 1993 BSD