Develop a simple GUI where you have a simple frame with a lean menubar containing three pull-down menus: Calculator with two menu items: Start that displays the calculator interface in the window, and Exit that terminates the calculator and clears the window.
Help opens another window that describes the basic operations of the calculator with an example for each.
About presents information about the author info on another window or dialog box.
Optional: You can show an image in the empty window when it is cleared, such as initially and after exiting the calculator.
The calculator should have two text fields to enter the operands and a choice component (combo box or radio button) to choose the operation (+,-, *, or /) to be performed, and a button (with the label "=" or "Compute") that computes the result in the result text field.
When the user presses the Compute button, it takes the integer values entered in the two text fields and performs the selected operation, and shows the result in the display text field.
Hint: You do not need to do error checking, however, you should provide good prompts (maybe example inputs) to the user so that it will not make any data entry error.