I'm extremely lost on this assignment. Using functions.

[whitesnow]

ok

[bluezor]

Instead of putting all your variables into the scope of your function only, why don't you put them in main() and use them as arguments to your functions?

i.e.

int main()
{
    double price;
    do_something_to_argument(price);
}

Then you have all your variables in one place and you can use them as arguments to your function "calculations" and make it nice and easy.