Write a Swing GUI application which simulates a calculator.
The calculator should have a non-editable textfield at the top.
At least the following buttons shoule be there: 0, 1, ..., 9, (, ), +, -, *, /,
C (clears the last pressed digit), AC (clears the entire data entered), ENTER (to display the result).
Arrange the buttons within appropriate JPanels. The layout should be as close as possible to the
calculator program on Windows.
To evaluate the expression, you may want to use two stacks, one for the numbers, and the other for the operators.