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Okay, so it's now time for a challenge.

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From this point forward in the course,
anytime we learn something new,

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I'm going to issue a challenge.

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I'm going to actually type it on
the screen shortly, and the idea is for

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you to actually go a way.

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An attempt to solve this challenge,
and actually write some code.

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And so,
you pause the video while that happens.

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And then you write the code.

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And then, you'll come back, and
actually check the results.

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So, what I'll do is,

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I'll actually show you my interpretation
of the challenge, and the solution.

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[INAUDIBLE] To the challenge.

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And then, you'll actually look at that,
and compare your challenge to it, and

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hopefully, you'll learn a lot more about
what you've actually just learned.

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So, let's go, and get started.

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And I'm gonna type in our first challenge,
which of course is for the if statement.

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Okay, so here is your first
challenge in the course.

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So, the idea is to write
a small program to ask for

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a name from the keyboard for the user
to type in a name and also an age.

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When both values have been
entered from a keyboard

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check if a person it the right
age to go on an 18-30 holiday.

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And an 18-30 holiday, what that means
is they must be over the age of 18 and

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under the age of 31, and
if they are, so if they are 18 or

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over and under 31, welcome to the holiday.

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Otherwise, print a polite
message refusing them entry.

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And that was a typo there.

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Should be otherwise print a polite
message refusing them entry.

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Alright, so I'll ask you now to pause
the video, and actually go away, and

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try and come up with the solution to this.

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And when you're ready, start the video
again, and I'll actually show you how

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my solution works, and
you can check that against your answer.

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So, pause the video now.

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Okay.

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How did you get on?

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Did you figure it out?

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Did you have a good
attempt at the challenge.

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And hopefully,
you've figured out a solution to it.

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So, let's now, go ahead and
actually come up with a solution.

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Now, bearing in mind with all challenges,

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there's quite often multiple
ways to actually achieve things.

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And the thing to keep in mind with this
is that just because you haven't typed

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a challenge, or

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solution that's not identical to mine
doesn't mean that you got it wrong.

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The end result is whether your program
has achieved the goals set up in

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the challenge.

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If it has achieved those goals, then you
know, that you've got a good solution.

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So, keep that in mind.

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Let's get started.

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So, first step.

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Write a small program to ask for
a name and an age.

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So we obviously, need to ask for
a name and the age.

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So, I can type name equals input.

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Please enter, your name.

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And then, put age equals

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int, input, how old are you?

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And we'll put a placement field in there,
and .format will actually use name.

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That was optional,

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you didn't have to actually print the name
out but that won't be bad if we do that.

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Okay, so the next thing we need to do,
is now we've got the name and the age,

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it's time to see whether the appropriate
age to go through to this 18-30 holiday,

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and that's obviously to be over 18 and
under 31.

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I think I said before that it was 18 or
older.

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But, I've actually typed it as over 18 and
under 31.

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So, it's up to you if you want to
actually put greater than or equal to 18.

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Obviously, the correct
solution will be either.

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Okay.

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So, let's just try it.

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So, what I'm going to do, I'm going
to actually assume that it's an 18-30

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holiday, so as long as they're within
that range, 18 to 30, they're good to go.

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So, one option would be to put
if 18 is less than equal to age,

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which is less than 31.

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Print.

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Welcome to club 18-30 holidays.

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You replace with field (0).format name.

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Else, print I'm sorry,

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our holidays are only for
seriously cool people.

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And so,
we've actually fulfilled the criteria.

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If they are, we welcome them to the
holiday, if they're in that date range.

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Otherwise, we put a polite
message refusing them entry.

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We'll run that challenge.

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Now, we'll enter our name.

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I'll put Tim.

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How old are you Tim?

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And notice I made a mistake there.

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I should've actually put a space there.

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Probably better to put a question mark
because it actually is a question.

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And then, that space as well.

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So, we'll try running that again.

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Tim.

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How old are you Tim?

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21.
Welcome to club 1830 Holidays Tim.

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Alright, so that's so far so good.

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So, let's actually try another scenario.

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Tim.
18.

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Welcome to club 1830 Holidays Tim.

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Yes, we still fulfilled it.

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But now if we type Tim again,
or type Thomas.

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Thomas [INAUDIBLE] something different.

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17.

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I'm sorry our holidays are only for
seriously cool people.

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So obviously, this 17 is working,

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and if we actually do another
test here we can put Brian 31.

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I'm sorry our holidays are only for
seriously cool people.

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So, that's working as well.

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So, this was one way to actually test,
and obviously, that's just one way, but

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we could also have done,
if I comment that out,

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we could quite easily also have
put if age is greater than or

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equal to 18 and age is less than 31.

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We could have done that, and

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if we run that it'll actually
give us the same result.

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So, if I put 17 in there,
excluded as we should be.

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Tim.
18.

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Welcome to Club 1830 Holidays Tim.

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That's correct.

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And likewise try 31, we should be
excluded cuz the range was 18 to 30.

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And the last one, Tim, say 25 or

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actually put 5 [INAUDIBLE], actually
was going to say I put 5 there, but

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I actually typed ahead, and
did actually put 25, so that's correct.

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So, there you go,
that's the first challenge, and again so

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depending on your answer if you
did it a different way there,

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you could have used even the or,
as we talked about in this lesson, or

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in the previous parts of this if statement
lessons, the two previous videos.

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That would've been correct.

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The main thing is that you're able to
actually check that they're actually

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within that range.

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And if they were in your program,
congratulations.

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You did well.

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Okay.
That's it for the if statement, so

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we've gone through and
learned how to do that.

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We've also gone through a challenge.

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In the next video, we're gonna
start looking at for-loops which is

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a way to actually repeat certain code, or
code blocks a certain amount of times, so

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I'll see you in that next video.