# Say

Given a number from 0 to 999,999,999,999, spell out that number in English.

## Step 1

Handle the basic case of 0 through 99.

If the input to the program is `22`, then the output should be
`'twenty-two'`.

Your program should complain loudly if given a number outside the
blessed range.

Some good test cases for this program are:

- 0
- 14
- 50
- 98
- -1
- 100

### Extension

If you're on a Mac, shell out to Mac OS X's `say` program to talk out
loud.

## Step 2

Implement breaking a number up into chunks of thousands.

So `1234567890` should yield a list like 1, 234, 567, and 890, while the
far simpler `1000` should yield just 1 and 0.

The program must also report any values that are out of range.

## Step 3

Now handle inserting the appropriate scale word between those chunks.

So `1234567890` should yield `'1 billion 234 million 567 thousand 890'`

The program must also report any values that are out of range.  It's
fine to stop at "trillion".

## Step 4

Put it all together to get nothing but plain English.

`12345` should give `twelve thousand three hundred forty-five`.

The program must also report any values that are out of range.

### Extensions

Use _and_ (correctly) when spelling out the number in English:

- 14 becomes "fourteen".
- 100 becomes "one hundred".
- 120 becomes "one hundred and twenty".
- 1002 becomes "one thousand and two".
- 1323 becomes "one thousand three hundred and twenty-three".

* * * *

For installation and learning resources, refer to the
[exercism Racket page](http://exercism.io/languages/racket).

You can run the provided tests through DrRacket, or via the command line.

To run the test through DrRacket, simply open the test file and click the 'Run' button in the upper right.

To run the test from the command line, run the test from the exercise directory with the following command:

```
raco test say-test.rkt
```

which will display the following:

```
raco test: (submod "say-test.rkt" test)
2 success(es) 0 failure(s) 0 error(s) 2 test(s) run
0
2 tests passed
```

## Source

A variation on JavaRanch CattleDrive, exercise 4a [http://www.javaranch.com/say.jsp](http://www.javaranch.com/say.jsp)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.