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QUESTION
Implement an advanced "Big Number" calculator by using JavaFX GUI.
Implement an advanced "Big Number" calculator by using JavaFX GUI. Use TextFields to show the input and output result and Buttons to set the operator (add +, subtract -, multiply x, larger >, smaller <, equal ==). Note that a Big Number can be a floating-point number (0.1 or 1111111111111111111111.5)
