# Functions go here...
def yes_no(question):
    """Checks that users enter yes / y or no / n to a question"""

    while True:
        response = input(question).lower()

        if response == "yes" or response == "y":
            return "yes"
        elif response == "no" or response == "n":
            return "no"
        else:
            print("Please enter yes (y) or no (n).\n")

def make_statement(statement, decoration):
    """Emphasises headings by adding decoration at the start and end"""

    print(f"{decoration * 3} {statement} {decoration * 3}")

def instructions():
    """Displays instructions"""
    print(make_statement("Instructions", "{}"))

    print('''This program will ask you for... 
    - The name of the pizza shop you have 
    - The title of your employees
    - The amount of each employee type (must be greater than 0)
    - The amount of hours each employee type works (must be greater than 0) 
    - The wages of that employee type (must be greater than $23.50)
    - Whether or not you have utility expenses (if you have 
      utility expenses, it will ask you what they are).
    - The name of your pizza
    - How much you sell each pizza for
    - How much it costs to make each pizza (must be less than the sell price)
    - Type 'xxx' into the name input when you're done with a section to move on to the next section.
    - You must have at least one entry for each section before moving on to the next 


The program outputs an itemised list of the employee and utility 
expenses (which includes the subtotals for these expenses). It also
outputs the profit you make per pizza and how many pizzas you need to 
sell on average, minimum, and maximum, to break even (rounded up).

The data will then be written to a text file which has the 
same name as your product and today's date.

    ''')

# Main Routine goes here
print(make_statement("Pizza Cost Calculator", "[]"))

print()
want_instructions =yes_no("Do you want to see the instructions?")
print()

if want_instructions == "yes":
    instructions()

print()
print(" program continues")