Original subtitles

All right guys in the next lesson I've got a leap year coding challenge for you and this is a really

interesting challenge although it is a little bit challenging but it's really cool because have you

ever wondered what makes a particular year a leap year and what makes another year not a leap year.

And it's easy enough to say that every four years it's a leap year.

But if you just got given a random year and you had to work out if it was a leap year then there's actually

rules that you can follow to figure this out.

So the rules are that on every year that is evenly divisible by four it's a leap year except every year

that is evenly divisible by 100.

So it.

So if it's divisible by four but it's divisible by 100 then it's not a leap year unless that year is

also evenly divisible by 400.

So the rules are a little bit complex but it might be easier if you look through some of the examples.

So for example if we wanted to figure out whether if year 2000 is a Leap Year 2000 divide by four divides

cleanly 500 with no remainder.

So it's a leap year when we divide 2000 by 100 then it's 20.

So it also divides cleanly.

So it's actually now not a leap year but but but 2000 divide by 400 equals five with no remainder.

So finally it actually is a leap year and you can look through the different examples and also look

at and also if you scroll down you can take a look at this Web site of known leap year and they show

you step by step each of the rules that we talk through just now and you can test different years such

as the year 2000 and you can see it step by step to see how they figured out whether if it is a leap

year or not.

Now I also recommend actually watching this video that I linked to up at the top.

If you're not familiar with the concept of leap year and even if you do understand leap year it's still

a fantastic video to really understand how we're adjusting for a mismatch in the Earth's rotation with

the seasons.

So I recommend taking a look at the video reading through each of these statements and taking a look

at the known leap year and the Web site that it links to and then to start thinking about how you would

write this logic.

Now in order to map out the logic I recommend creating a flowchart of your own on drawdown IO and to

use the flowchart to see how your code should flow.

Now if you want a little bit of extra help I'm about to reveal the flowchart that I've created.

If you want to first try to create your own and see if you get it right then pause the video now.

All right.

So let's take a look at the flow chart that I created.

If you click on this link in hint number three you'll be taken to a page that looks like this.

And so if we map out those rules and we click start we see is it clearly divisible by four.

If no then it's definitely not a leap year but if it is then we have to check the next thing is it cleanly

divisible by 100.

No.

Well then it's definitely a leap year.

But if it's yes then we have the check.

The final thing is it cleanly divisible by 400.

If yes then it's a leap year.

If no it's not a leap year.

And that flowchart basically translates these three lines of logic.

Now if English is not your first language then I recommend to take a look at the flowchart and also

take a look at the rules for leap here in your own language.

But once you're happy that you understand what's going on then it's time to tackle the challenge and

write your code.

Now remember you have to output exactly the words leap here full stop or not leap here.

Full stop and look at the capitalization and where the spaces and full stops go that way when you check

solution.

It'll actually be a partial code if everything is correct.

So head over to the next lesson and tackle this challenge now.