How to simply pass numbers and equations across view controllers? : <p>I want to have 3 View Controllers; A, B, and C. View Controller A will be where the final value gets displayed, or the Main View Controller. View Controller B and View Controller C will have simple Text Fields as inputs. The values you put into the Text Fields in View Controller B and C will be added together and shown in View Controller A. You will also need to have buttons to implement the action. How can this be done?</p>

<p>For instance, if the user inputs the number 2 in View Controller B and the number 3 in View Controller C text fields, then View Controller A will show the number 5.</p>
