As a developer, I want a POCO class to store the data related to the expression

[nickmartin1ee7]

Given...
Always

When...
Any button is pressed that affects the input values, or operator

Then...
Store those changes within an expression class/object (POCO)

[srjheam]

Do you intend to create a calculator history with this?

[itiannerona]

Yeah. Probably work on this later this day.

[itiannerona]

Removing myself from this issue and focusing on #39 since I thought that having a test class will be more beneficial in the long run. If there are no takers, I will come back to this.