# Leap

Write a program that will take a year and report if it is a leap year.

The tricky thing here is that a leap year occurs:

```plain
on every year that is evenly divisible by 4
  except every year that is evenly divisible by 100
    unless the year is also evenly divisible by 400
```

For example, 1997 is not a leap year, but 1996 is.  1900 is not a leap
year, but 2000 is.

If your language provides a method in the standard library that does
this look-up, pretend it doesn't exist and implement it yourself.

## Notes

For a delightful, four minute explanation of the whole leap year
phenomenon, go watch [this youtube video][video].

[video]: http://www.youtube.com/watch?v=xX96xng7sAE

Check out [Exercism
Help](http://help.exercism.io/getting-started-with-haskell.html) for
instructions to get started writing Haskell.

## Running Tests

Use `runhaskell` (included in the Haskell Platform) to compile and run your
Haskell code.

    $ runhaskell -Wall bob_test.hs

## Source

JavaRanch Cattle Drive, exercise 3 [view source](http://www.javaranch.com/leap.jsp)