This assignment is optional.

If you attempt it, it will not negatively affect your grade.

It may, however, improve your overall grade by up to ten percentage points.

This assignment will be graded out of 100:

60 for a working program

20 for elegant code

10 for good-looking code

10 for the rest :)

Copying code from other students will be penalized.

If this grade is less than 61, I will ignore it.

If it is 61 or more, I will calculate an percentage adjustment to your final course grade using the formula

percent adjustment = ( grade on this assignment - 60 ) / 4.0

For example, if you score a 90 on this assignment, you'll receive a 7.5% adjustment ([90-60]/4) to your final course grade.

At the end of the semester, this adjustment (which will be greater than zero and less than or equal to 10) will be added to your course percentage grade (maxing out at 100%)

14∙59∙57≻ mix run -e "Extra.Guesser.play"
I'm thinking of a number between 1 and 100
    IS IT 50?
high
    IS IT 25?
low
    IS IT 37?
high
    IS IT 31?
high
    IS IT 28?
low
    IS IT 29?
yes!
    THE NUMBER IS 29

This is the output of running an Elixir application. It implements the "thinking of a number" game itself (the nonindented output) and a client that tries to guess the number (the indented upper case output).

The game server is implemented as a supervised OTP server. The low and high numbers are supplied to it as parameters by the worker call when the supervisor is defined.

The guesser is a separate module. When you invoke its play function, it starts a new game on the GameServer. The GameServer responds with the low and high values. The guesser then uses these to produce a series of guesses. Each time, it asks the GameServer if the guess is correct. The server responds with either :low, :high, or :correct.

(There is an optimal guessing strategy which is O(log n), where n is high - low.)

Both the game server and the guesser use IO.puts to log what they are doing, as shown above.

This repository provides the project skeleton, along with the top-level supervisor (lib/extra.ex). The rest is up to you.

To give you an idea of the expected effort, my solution is just over 50 total lines of code (excluding blank lines).

You might find :rand.uniform/1 useful: http://erlang.org/doc/man/rand.html#uniform-1