24.03.2010

Målet med denne første oppgaven er at jeg skal få et inntrykk av hvordan du 
programmerer, og hvilket ferdighetsnivå du er på. Ikke forsøk å gjøre løsningen 
helt perfekt (for å imponere), programmer bare som du vanligvis gjør. Kjører du 
deg helt fast er det bare å spørre meg om hjelp.

Ettersom programmerere må beherske engelsk for å kunne lese API dokumentasjon, 
programmeringsbøker og lignende, velger jeg å skrive oppgaven på engelsk, sånn 
at du får trening med det. Det er faktisk helt vanlig å skrive spesifikasjoner, 
dokumentasjon etc på engelsk i bransjen, selv om alle i bedriften er norske.

Jeg bruker også en ganske vanlig/standard måte å beskrive kravene på:

Feature: <Feature name>
	In order to <some benefit>
	As <some role>
	I want <some functionality>

Assignment : Command-line Cash Register
---------------------------------------
The assignment is to make a simple, console based cash register application - 
something that could possibly be used in a shop. The cash register should know 
about all the items the shop is selling, and the prices.

Feature: List items
	In order to know what it's possible to buy
	As a cash register operator
	I want to be able to list all items in shop with prices

Example session (you don't need to reproduce it exactly like this):
-------------------------------------------------------------------
Welcome to the Cash Register!
READY> :list
Items in shop:
 Bread     $ 3.99
 Milk      $ 2.50
 Butter    $ 4.00
READY>

"READY>" is a prompt waiting for user input. ":list" is the command to list the 
shop items.

Feature: Add items to bill
	In order to calculate what the customer should pay
	As a cash register operator
	I want to be able to add items with quantity and get the accumulated total

Patter for entering items: <item name> + space + <count>.

Example (you still don't have to format it like this):
------------------------------------------------------
welcome to the Cash Register!
READY> bread 1
 Bread X 1           = $ 3.99
               Total = $ 3.99
READY> milk 2
 Milk X 2            = $ 5.00
               Total = $ 8.99
READY>

Feature: Checkout
	In order to know the amount of money to give back to the customer
	As a cash register operator
	I want to enter the amount given by the customer and get the amount to return

Example (continues from  example):
-------------------------------------
READY> :checkout 10
	Received           $ 10.00
	Total              $  8.99
	Return             $  1.01

(Bill cleared, ready for new customer)
READY>

Good luck!