Adding decimals together using buttons

Question

I am creating a POS system using windows forms for a school project and would like to be able to add decimals together using the code in a button and come up with a total as the output at the end... any ideas on how this can be done?

Answer 1

If following doesn't answer your questions, please edit your post by elaborating your question.

Two questions I get so far.

1. Add a decimal to an undetermined length array.

Generally using List in C# if data keeps growing.

// Put this as your member variable
List<decimal> m_ItemPriceInOrder = new List<decimal>;

// In your button event
decimal price = ... // Get your price of item
m_ItemPriceInOrder.Add( price );

2. To sum up cost of items when checkout.

Using foreach to iterate through every item in your list. Also a simple for loop is okay, but foreach represents "iterating through every item".

decimal sum = 0;
foreach( var item in m_ItemPriceInOrder ){
    sum+=item;
}