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# React
Implement a basic reactive system.
Reactive programming is a programming paradigm that focuses on how values
are computed in terms of each other to allow a change to one value to
automatically propagate to other values, like in a spreadsheet.
Implement a basic reactive system with cells with settable values ("input"
cells) and cells with values computed in terms of other cells ("compute"
cells). Implement updates so that when an input value is changed, values
propagate to reach a new stable system state.
In addition, compute cells should allow for registering change notification
callbacks. Call a cell’s callbacks when the cell’s value in a new stable
state has changed from the previous stable state.
## Getting Started
Make sure you have read the
[C page](http://exercism.io/languages/c) on the Exercism site. This covers
the basic information on setting up the development environment expected
by the exercises.
## Passing the Tests
Get the first test compiling, linking and passing by following the [three
rules of test-driven development][3-tdd-rules].
The included makefile can be used to create and run the tests using the `test`
task.
make test
Create just the functions you need to satisfy any compiler errors and get the
test to fail. Then write just enough code to get the test to pass. Once you've
done that, move onto the next test.
[3-tdd-rules]: http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
As you progress through the tests, take the time to refactor your
implementation for readability and expressiveness and then go on to the next
test.
Try to use standard C99 facilities in preference to writing your own
low-level algorithms or facilities by hand.
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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