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All right, congratulations for
making it through this section.

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We covered a lot of
material in this section.

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Hopefully, you have a
pretty good grasp of c++

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functions and how they work.

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Now you're ready for a challenge.

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This challenge won't be easy.

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Remember the challenge from section 9.

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In that challenge, we had a vector of
integers and we wrote a menu-driven

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system that allowed the user to
display the numbers, add a number

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to the list, calculate the mean,
the smallest and the largest.

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That challenge was all about
applying what you learned up to

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that point in the course, and let
you use control flow statements

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like loops and if statements.

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Well, for this challenge, we're going
to solve that problem all over again.

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Except this time our solution will
be modularized in terms of functions.

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You can start with your solution and
refactor it so that it uses functions.

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Or you can start with my
solution which is included in the

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challenge project in workspace 11.

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Or you could start this challenge
from scratch, it's really up to you.

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Let me give you a few hints
and tips for this challenge.

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Remember, this is not an easy
challenge, so if you get frustrated

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take a break, come back to it later.

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Here are a few hints.

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Create functions for each of the
major functions in the program.

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Keep the function small.

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Remember the boss worker analogy.

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Keep the vector declaration
in the main function and

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pass the vector object to any
function that requires it.

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Don't be tempted to move that
vector object outside the main

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and make it a global variable
that will really defeat the

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whole purpose of this exercise.

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Now you can start by defining a
function that displays the menu,

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that's a real simple function call
it display menu, and all it is

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is a bunch of output statements.

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And then you can call that function
whenever you need to display the menu.

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You can then define a function
that reads the selection from the

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user and returns it in uppercase.

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That way we don't have to
deal with checking lowercase

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and uppercase selections.

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Then create functions
for each menu option.

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And then finally, create functions
that display the list of numbers,

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function that calculates the mean
a, function that looks for the

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smallest and the largest and so forth.

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Take it one function at a
time, and take your time.

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Again, if you get
frustrated, take a break.

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Finally, don't forget to
use function prototypes.

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Use them, let the compiler
help you every step of the way.

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All right, good luck.

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I know you can do it.

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When you're finished, compare it to my
solution, which is in the next video.