Teach Yourself Borland C++ in 14 Days - portal

504 Appendix A
Day 5
5. To override a function means to replace a function in the base class with a function
in your derived class. The new function must have the exact same name, parameters,
and return type to override the base class function.
6. Call the base class function from within the overridden function:
void MyClass::DoIt()
{
BaseClass::DoIt();
// do some other stuff
}
7. An initializer list initializes a class’s data members and calls any base class constructors
prior to the body of the constructor being entered.
8. Yes. It’s very common.
9. Multiple inheritance. Derive the class from two separate base classes.
1. No. Only visual components can be seen at design time.
2. None is best. All have their own strengths and weaknesses.
3. No. VCL objects must be allocated dynamically (using the new operator).
4. Yes and no. For the most part they are equivalent. Since VCL is written in Object
Pascal, there are no overloaded VCL methods.
5. Yes.
6. TOpenDialog, TSaveDialog, TRegistry, TColorDialog, TTimer, TImageList,
TFontDialog, and many more.
7. Yes. All components are ultimately derived from TComponent, so they all have the
properties found in TComponent (such as Name and Owner, for instance).
8. Top, Left, Owner, Parent, Width, Height, and so on.
9. Yes.
10. A canvas. VCL encapsulates device contexts through the TCanvas class.
Day 6
1. Right-click on the toolbar and choose Properties from the toolbar speed menu.
2. Drag them to the toolbar and drop them where you want them.
3. Drag unwanted buttons off the bottom of the toolbar and drop them.