By R. J. Mitchell (auth.)

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The front panel contains various LEDs, seven-segment displays, switches, buttons and a keypad. The user will move a mouse around the screen, and can press a button or switch by positioning the mouse over the device and pressing the left button on the mouse. The system will respond suitably by illuminating the displays. 00000000 00000000 A7 •• AO A15 .. 9 Simulated front panel of microprocessor system 'The program should allow the user to input a simple program, by entering the appropriate binary data into the memory of the microprocessor, and then the microprocessor should 'run' the program.

TWINDOW also uses the multiple inheritance class hierarchy for handling input from the user; this hierarchy is implemented in the following three modules. 32 C++ Object-Oriented Programming KEYIN, the keyboard input module, contains the class for handling the keyboard; testing if a key has been pressed and reading the value of a key press. This is the lowest level in the hierarchy and is described in chapter 7. MOUSE, the mouse processing module, contains the class for detecting movement of the mouse and for testing the state of its buttons.

Once a class has been declared, its member functions may be written. These must specify that they belong to the particular class, but are otherwise declared like any other function. In addition, all the member functions have access to all other member functions and variables, regardless of whether such items are private or public. A class declaration and its functions define an object type which may be used. To use the class, however, a variable of that class (an object) must be declared, and this is achieved as for any other variable except that any arguments for its associated constructor must also be given: in the examples in chapter 1, the constructors have no arguments, so the objects are declared with no arguments.

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