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Algorithm Name: Vending Machine
Assumptions:
only dispense change in coins (5, 10, 25 cents)
different items could have different costs
users can press a button for requested item type, or to return all input money
there is a message window, can call "print(string)" and it will display.in LED
there is a "dispense(item type)" function
assume that machine will reject all coins except US nickel, dime, or quarter
it is our responsibility to update Bal and coins[C], but the machine will keep track of available[X] for us
Representation:
there is a counter called "Bal" that keeps track of total of coins input so far
cans could have different costs: cost[X]
available[X] is a boolean variable that indicates whether there is (1 of X left
the internal reservoir of coins is represented by coins[C] where C is 5, 10, or 25 and returns an ordinal number for how many coins of that type there are inside
Strengths
if machine is completely out of requested choice (or all cans), user can ask for their money back
algorithm is guaranteed never to give back more than the balance
if the user just asks for their money, back we can guarantee to always make change (at least by using the coins they input, but not necessarily)
Limitations:
it is possible that this algorithm might by unable to make change, for example, in the case where a user puts in $1.00 (4 quarters), buys an item that costs $0.90, and we have no dimes or nickels to start with
Pseudocode:
if user inputs a legal coin C (e.g.