There is a subreddit on reddit called /r/dailyprogrammer and while they don’t actually post exercises daily, they do sometimes post neat questions that are fun to solve. About a week ago, they posted a problem that I solved with F# that I wanted to share. For the impatient, my full source is available at this fssnip.
The description is as follows:
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Unix , the famous multitasking and multi-user operating system, has several standards that defines Unix commands, system calls, subroutines, files, etc. Specifically within Version 7 (though this is included in many other Unix standards), there is a game called “arithmetic”. To quote the Man Page :
Arithmetic types out simple arithmetic problems, and waits for an answer to be typed in. If the answer
is correct, it types back “Right!”, and a new problem. If the answer is wrong, it replies “What?”, and
waits for another answer. Every