# Lab 3: Snack Bar

## Objective

To gain experience writing programs which take input, perform calculations
and output results.

## Task

For this lab, you'll be creating a program that could be used for workers
at a snack bar. The snack bar sells 4 items at different prices:

Item | Cost |

Bottles of water | .50 |

Candy bars | 1.00 |

Bags of popcorn | 0.25 |

Cans of soda | 0.75 |

Your program will help the snack bar workers by figuring out the total
cost of all items that a customer wants to purchase. It will ask how many
items of each type the customer has selected, calculate the total, and
print it to the screen.

For example, if someone purchases 2 bottles of water, 4 candy bars, 4 bags
of popcorn and 2 cans of soda, the program should calculate their total cost
as $7.50.

## Details

- Start by asking the user how many bottles of water were purchased, and store
the result in a variable.
- Do the same thing for the other three items. You will need to use different
variable names for each of the four items!
- After getting all of the input, you will need to calculate the total cost.
This can be done by multiplying each item's count by its cost, and then adding
them all together. Save the result of this calculation into another variable.
- Finally, print the total cost to the screen so the snack bar worker knows
the result.

## Testing

Your program should work for any number of items that the user selects.
Of course you can't test *every* possible input, but you should test
with several different ones.

Below are a couple of example runs you can try out. The answers that
the user gives are given in bold face:

How many bottles of water? **2**
How many candy bars? **4**
How many bags of popcorn? **4**
How many cans of soda? **2**
The total cost is 7.5

How many bottles of water? **1**
How many candy bars? **2**
How many bags of popcorn? **3**
How many cans of soda? **4**
The total cost is 6.25

How many bottles of water? **100**
How many candy bars? **0**
How many bags of popcorn? **0**
How many cans of soda? **1**
The total cost is 50.75

## Submitting

When your program is finished, email the .py file to ifinlay@umw.edu. Please attach
it as a file instead of copying it into the body of the message!
Copyright ©
2021
Ian Finlayson | Licensed under a Creative Commons Attribution 4.0 International License.