Heavy Metal Bake Sale
It is 1999 and a local metal band is looking to have a bake sale to raise funds for their new album.
They have promised you a free CD if you make software to help run the sale;
they are musicians not mathematicians after all.
There are four items they would like to sell on this sale with specific prices and quantities of each:
| Item | Price | Quantity | Purchase Code |
|---|---|---|---|
| Brownie | $0.75 | 48 | B |
| Muffin | $1.00 | 36 | M |
| Cake Pop | $1.35 | 24 | C |
| Water | $1.50 | 30 | W |
The application must calculate the correct change to give a person if they overpay.
If you do not have stock of an item, you cannot make the sale. Purchases are input as a comma delimited string.
The Purchase Code from above will be used in the string to indicates which items are in the transaction.
- If all items are in stock - respond with a total amount.
- If an item is out of stock, respond with "X is out of stock" where X is the item out of stock.
- After the total, prompt for amount paid.
- If the amount is equal to or greater than the amount due display change due.
- If the amount is less than the amount due it responds with “Not enough money.”
| Examples |
|---|
|
Items to Purchase > B,C,W Total > $3.50 Amount Paid > $4.00 Change > $0.50 |
|
Items to Purchase > B Total > $0.75 Amount Paid > $0.75 Change > $0.00 |
|
Items to Purchase > C,M Total > $2.35 Amount Paid > $2.00 Change > Not enough money |
|
Items to Purchase > W Total > Water is out of stock |
Hint
Look to use Stubs or Mocks or both when handling input and output concerns.
Bonus
Its many years later and your friends are once again looking to have a bake sale to make an album.
You dust off your software from 1999 and refactor it to read the items, quantity and price all come from a configuration file.
It must also now work as a Restful web service instead of writing to the console.
Solutions
You can find all language solutions here Heavy Metal Bake Sale Solutions
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