/*!
    \example script/calculator
    \title QtScript Calculator Example
    \ingroup scripting

    In this simple QtScript example, we show how to implement the
    functionality of a calculator widget.

    \image qtscript-calculator-example.png

    The program logic in this example is a fairly straight port of the logic in the C++ \l{Calculator Example}.
    The graphical user interface is defined in a UI file.

    The C++ part of the example consists of four steps:
    \list
    \i Evaluate the script code that defines the \c{Calculator} class;
    \i Create a widget from the UI file using QUiLoader;
    \i Call the Calculator constructor function to create a new \c{Calculator} script object, passing the widget as argument;
    \i Show the widget and start the application event loop.
    \endlist

    On the script side, the \c{Calculator} constructor function
    initializes the instance variables of the new \c{Calculator}
    object, and connects the clicked() signal of the widget's buttons
    to corresponding functions defined in the \c{Calculator} prototype
    object, so that when a button is clicked, the proper script
    function will be invoked to carry out the operation.
*/
