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Once you have defined all your widgets and made any modifications, you can then run the application. You do this with the KApplication object's exec member function.

myapp.exec();

When the user closes the application, control returns to the main function, which can then terminate the program. Usually, the return statement with the exec function will return any errors that exec may return.

Comments are an important part of any programming language. Without good comments a program can be hard to understand. Without good comments, even the person who wrote the program may not be able to follow the program s logic when reading the program at a later time. Comments are not executable statements. They are used to annotate a program and format the text of the program to look nice and make the logic of the program

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return myapp.exec();

The following program creates a simple KDE application that displays a window:

understandable by someone trying to read the program. Comments can also divide the program into sections, making it easy to see where the various operations begin and end. Comments can be in a line of their own, or they can be inline with a statement. Any text in a line after and including the comment indicator will be ignored and is not considered part of the statement. RobotBASIC allows for two methods of indicating a comment. The character combination // is one and the character is another. For example:

#include <kapp.h> #include <ktmainwindow.h> int main( int argc, char **argv ) { KApplication myapp( argc, argv ); KTMainWindow mywin; mywin.setGeometry(100,100,200,100); myapp.setMainWidget(&mywin); mywin.show(); return myapp.exec(); }

Many systems will have set up the KDEDIR and QTDIR shell variables. KDEDIR would contain the path names for the KDE commands, headers, and libraries, and QTDIR would contain the path names for Qt. To specify the header files for KDE you would use the following:

Be sure to include the $ before KDEDIR. If KDEDIR is not already defined, you can define it yourself, assigning the location (if you know it) of the KDE components:

//this is this too d = 9 b = d*2 a comment on a line by itself is another comment //this is a comment inline with a statement so is this comment

On Red Hat Linux, the Qt libraries for 6.0 are placed in the /usr/lib/qt directory, and KDE libraries are mixed with other libraries in the /usr/lib directory. You will not have to specify a KDE library, and for Qt, you specify the /usr/lib/qt directory. Caldera OpenLinux, along with other distributions, currently defines the KDE libraries to be in the /opt/kde directory. In the following example, both the KDE and Qt libraries are specified for the myapp.cpp KDE program.

g++ -I$KDEDIR/include -L$KDEDIR/lib -I$QTDIR/include -L$QTDIR/libs lkdecore lkdeui lqt myapp.cpp

An assignment statement is where you would assign a value to a variable. Variables are storage spaces for values that will be used in the program logic. Variables can be simple variables or array elements. See the sections on variables (Sec. B.7.3) and arrays (Sec. B.7.4) for more detail on what a variable or array is and how to use it. In the discussion below Var means a simple variable and VarA[...] means an array element. See the section on expressions for further details of what an expression is. Assignment statements are like this:

KDE and Qt use signals and slots to allow one widget to communicate with another. Signals and slots are member functions defined in a class that have special capabilities. Signals are

emitted by an object when it is activated by some event occurring on it For example, when a user clicks a button object, the button will emit a clicked signal This signal can then be picked up by any other object set up to receive it Such an object will have slots that are designated to receive the signal A slot is just a member function that executes when the object receives a certain signal In effect, slots operate like event handlers, and signals can be thought of as events, but KDE and Qt do not operate like standard event-driven GUIs Instead, the process of event handling is implemented as messages are sent and received by objects Instead of focusing on the processing of an event when it occurs, objects manage their own event tasks as they occur, whether that be receiving or sending signals.