self service checkout machine

Hi i need to use MATLAB to create a self service checkout machine that gives the user the optimal change using the formula -

change = payment - puchase

using valid australian coins and notes

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the free MATLAB Onramp tutorial to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Lauren]

[Lauren]

This is what i have but i need the program to say 'program complete' with 'Ok' button when i click exit and i need to figure out the code to calculate the optimal change when an amount is put in the 'enter purchase amount and 'enter payment amount'

[Steven Lord]

Can you walk through a problem manually? According to Wikipedia possible coin denominations are 5c, 10c, 20c, 50c, $1, and $2. [Let's leave out the discontinued 1c and 2c.]

So if I gave you a tray with a bunch of coins of each of those denominations and asked you to give me $4.65 how would you go about determining what coins to give me? Be methodical; I don't just want the answer I want you to think about how you determined the answer.

Once you've solved that problem, can you generalize it to any amount of change?

If you can do that, can you then determine how to translate your manual algorithm into MATLAB code?

[Lauren]

Thats what im confused about, im not sure how to get the optimal change with a matlab code

[Steven Lord]

Don't worry about the MATLAB code for right now. Assume you have an adequate supply of 5c, 10c, 20c, 50c, $1, and $2 coins. Write out in words not code the procedure you'd follow manually for giving $4.65 in change. Imagine you're trying to teach a child how to complete that task, so don't handwave any of the steps.

Do you start off with the 5c coins, the $2 coins, or one of the other denominations?

Answer 1

[Hiro Yoshino]

How about this? Is this what you expected?

change = 978;
% Ausie coins
coins = [1 2 5 10 20 50 100 200];
numCoins = zeros(size(coins)); % memory allocated
%
for i=numel(coins):-1:1
    numCoins(i) = fix(change/coins(i));
    change = mod(change,coins(i));
end

bar(coins,numCoins);

coins

coins = 1×8

1 2 5 10 20 50 100 200