Instead of gracefully returning an error code to the parentapplication, I print the error to the screen and bail out of the code.
我没有按通常作法将错误代码返回给父代应用程序，而是将错误打印到屏幕，然后退出程序。
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ParentApplication: Active listening helps to build strong communication and involves eye contact, nods, and other non-verbal cues that suggest understanding and interest.
Application Windows always fill their assigned frame, with the exception of transient Windows and popup dialog boxes which float above their parentapplication at the appropriate size.