Please note, this blog entry is from a previous course. You might want to check out the current one.
Modify the UILabel you added last week to show your CalculatorBrain’s description instead. It should put an = on the end of it (and be positioned strategically so that the display looks like it’s the result of that =). This = was Extra Credit last week, but it is required this week.
When setting the display value use the calculator-brain description for the history text (adding an equal sign).
var displayValue: Double? { ... set { ... history.text = brain.description + " =" } }
And when starting a new number use it without the equal sign:
@IBAction func appendDigit(sender: UIButton) { ... history.text = brain.description != "?" ? brain.description : "" } }
The complete code for the task #8 is available on GitHub.
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