Leap Years

1. Leap Years

2. What is a leap year? • In most years, February has 28 days. • Approximately every 4 years, February has 29 days. • The years in which February has 29 days are called leap years.

3. What is a “century” year? • A “century” year is any year that is evenly divisible by 100 • Examples1800, 1900, 2000, etc. are evenly divisible by 100 so they are “century” years

4. How can you know if a year is a leap year? • The rules to determine if a specific year is a leap year or not depend on : whether the year is a century year or a non-century year.

5. “Century” Years • A century is a leap year if it is divisible by 400 • Examples: The year 1800 is NOT a leap year since it is NOT evenly divisible by 400 1800 / 400 = 4.5The year 2000IS a leap year since it IS evenly divisible by 400 2000 / 400 = 5

6. Non-Century Years • A non-century year is a leap year if it is evenly divisible by 4 • Examples: The year 1995 is NOT a leap year since it is NOT evenly divisible by 4 1995/ 4 = 498.75The year 1996IS a leap year since it IS evenly divisible by 4 1996 / 4 = 499

7. Using the IF statement

8. How to determine if it is a century year? If year Mod 100 = 0 Then ‘century yearElse ‘ non-centry yearEnd If

9. How do you determine if a year is leap year If year Mod 100 = 0 Then ‘century year If year Mod 400 = 0 ‘ leap year End IfElse ‘ non-centry year If year Mod 4 = 0 ‘ leap year End IfEnd If