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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
## Testing Exercises
If you followed the [installation instructions](http://exercism.io/languages/factor/installing), just run the provided test suite against your implementation with `"exercise-name" test`.
## Submitting Exercises
Note that, when trying to submit an exercise, make sure the solution is in the `exercism/factor/exercise-name` directory.
For example, if you're submitting `bob.factor` for the Bob exercise, the submit command would be something like `exercism submit exercism/factor/bob/bob.factor`.
For more detailed information about running tests, code style and linting,
please see the [help page](http://exercism.io/languages/factor).
## 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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