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:

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.

Check out Exercism Help for instructions to get started writing Haskell.

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

$ runhaskell -Wall bob_test.hs

JavaRanch Cattle Drive, exercise 3 view source