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We are working towards making exercises stand-alone. That is to say: no more generating READMEs on the fly. This will give maintainers more control over each individual exercise README, and it will also make some of the backend logic for delivering exercises simpler. The README template uses the Go text/template package, and the default templates generate the same READMEs as we have been generating on the fly. See the documentation in [regenerating exercise readmes][regenerate-docs] for details. The READMEs can be generated at any time using a new 'generate' command in configlet. This command has not yet landed in master or been released, but can be built from source in the generate-readmes branch on [configlet][]. [configlet]: https://github.com/exercism/configlet [regenerate-docs]: https://github.com/exercism/docs/blob/master/maintaining-a-track/regenerating-exercise-readmes.md
99 lines
2.2 KiB
Markdown
99 lines
2.2 KiB
Markdown
# Say
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Given a number from 0 to 999,999,999,999, spell out that number in English.
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## Step 1
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Handle the basic case of 0 through 99.
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If the input to the program is `22`, then the output should be
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`'twenty-two'`.
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Your program should complain loudly if given a number outside the
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blessed range.
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Some good test cases for this program are:
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- 0
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- 14
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- 50
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- 98
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- -1
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- 100
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### Extension
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If you're on a Mac, shell out to Mac OS X's `say` program to talk out
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loud.
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## Step 2
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Implement breaking a number up into chunks of thousands.
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So `1234567890` should yield a list like 1, 234, 567, and 890, while the
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far simpler `1000` should yield just 1 and 0.
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The program must also report any values that are out of range.
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## Step 3
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Now handle inserting the appropriate scale word between those chunks.
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So `1234567890` should yield `'1 billion 234 million 567 thousand 890'`
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The program must also report any values that are out of range. It's
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fine to stop at "trillion".
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## Step 4
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Put it all together to get nothing but plain English.
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`12345` should give `twelve thousand three hundred forty-five`.
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The program must also report any values that are out of range.
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### Extensions
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Use _and_ (correctly) when spelling out the number in English:
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- 14 becomes "fourteen".
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- 100 becomes "one hundred".
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- 120 becomes "one hundred and twenty".
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- 1002 becomes "one thousand and two".
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- 1323 becomes "one thousand three hundred and twenty-three".
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## Elm Installation
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Refer to the [Exercism help page](http://exercism.io/languages/elm) for Elm
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installation and learning resources.
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## Writing the Code
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The first time you start an exercise, you'll need to ensure you have the
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appropriate dependencies installed.
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```bash
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$ npm install
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```
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Execute the tests with:
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```bash
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$ npm test
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```
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Automatically run tests again when you save changes:
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```bash
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$ npm run watch
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```
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As you work your way through the test suite, be sure to remove the `skip <|`
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calls from each test until you get them all passing!
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## Source
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A variation on JavaRanch CattleDrive, exercise 4a [http://www.javaranch.com/say.jsp](http://www.javaranch.com/say.jsp)
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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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