what does Error “Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)” mean?

This line

secondNumber = Screen.text!.toInt()!

means: Get the Screen object, get the text property and please crash if it doesn’t exist, then get the text converted to an integer, and please crash if it doesn’t exist.

That’s what the ! means: “I am sure this thing exists, so please crash if it doesn’t”. And crash is what it did.

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