Welcome to Leap on Exercism's Common Lisp Track.
If you need help running the tests or submitting your code, check out HELP.md.
Given a year, report if it is a leap year.
The tricky thing here is that a leap year in the Gregorian calendar 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.
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.
- @verdammelt
CodeRanch Cattle Drive, Assignment 3 - https://coderanch.com/t/718816/Leap