68 lines
2.1 KiB
Markdown
68 lines
2.1 KiB
Markdown
# Secret Handshake
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> There are 10 types of people in the world: Those who understand
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> binary, and those who don't.
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You and your fellow cohort of those in the "know" when it comes to
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binary decide to come up with a secret "handshake".
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```text
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1 = wink
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10 = double blink
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100 = close your eyes
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1000 = jump
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10000 = Reverse the order of the operations in the secret handshake.
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```
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Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
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Here's a couple of examples:
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Given the input 3, the function would return the array
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["wink", "double blink"] because 3 is 11 in binary.
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Given the input 19, the function would return the array
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["double blink", "wink"] because 19 is 10011 in binary.
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Notice that the addition of 16 (10000 in binary)
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has caused the array to be reversed.
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## Getting Started
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Make sure you have read the "Guides" section of the
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[C track][c-track] on the Exercism site. This covers
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the basic information on setting up the development environment expected
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by the exercises.
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## Passing the Tests
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Get the first test compiling, linking and passing by following the [three
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rules of test-driven development][3-tdd-rules].
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The included makefile can be used to create and run the tests using the `test`
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task.
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make test
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Create just the functions you need to satisfy any compiler errors and get the
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test to fail. Then write just enough code to get the test to pass. Once you've
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done that, move onto the next test.
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As you progress through the tests, take the time to refactor your
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implementation for readability and expressiveness and then go on to the next
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test.
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Try to use standard C99 facilities in preference to writing your own
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low-level algorithms or facilities by hand.
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## Source
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Bert, in Mary Poppins [http://www.imdb.com/title/tt0058331/quotes/qt0437047](http://www.imdb.com/title/tt0058331/quotes/qt0437047)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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[c-track]: https://exercism.io/my/tracks/c
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[3-tdd-rules]: http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd
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