instructions.md

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.

1. Write boolean expressions to determine divisibility for the rules given above

2. Combine these expressions to a single boolean expression that describes whether a given year y is a leap year

3. Wrap it in the isleapyear function

julia> isleapyear(2000)
true