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# Leap
Given a year, report if it is a leap year.
The tricky thing here is that a leap year in the Gregorian calendar 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
Though our exercise adopts some very simple rules, there is more to
learn!
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
## Loading your exercise implementation in PolyML
```
$ poly --use {exercise}.sml
```
Or:
```
$ poly
> use "{exercise}.sml";
```
**Note:** You have to replace {exercise}.
## Running the tests
```
$ poly -q --use test.sml
```
## Feedback, Issues, Pull Requests
The [exercism/sml](https://github.com/exercism/sml) repository on
GitHub is the home for all of the Standard ML exercises.
If you have feedback about an exercise, or want to help implementing a new
one, head over there and create an issue. We'll do our best to help you!
## Source
JavaRanch Cattle Drive, exercise 3 [http://www.javaranch.com/leap.jsp](http://www.javaranch.com/leap.jsp)
## 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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