Exam 11: Inheritance and Composition

The preprocessor directive ____________________ is used to prevent multiple inclusions of a header file in a program.

To define new classes in C++,you create new ____________________ files.

What is the output of the following program? #include <iostream> Using namespace std; class bClass { public: $\quad$ void print()const; $\quad$ bClass(int a = 0,int b = 0); $\quad$$\quad$ //Postcondition: x = a; y = b; private: $\quad$ int x; $\quad$ int y; }; class dClass: public bClass { Public: $\quad$ void print()const; $\quad$ dClass(int a = 0,int b = 0,int c = 0); $\quad$$\quad$ //Postcondition: x = a; y = b; z = c; private: $\quad$ int z; }; Int main() { $\quad$ bClass bObject(2,3); $\quad$ dClass dObject(3,5,8); $\quad$ bObject.print(); $\quad$ Cout << endl; $\quad$ dObject.print(); $\quad$ cout << endl; $\quad$ return 0 ; } void bClass::print()const { $\quad$ cout << x << " " << y << endl; } bClass::bClass(int a,int b) { $\quad$ x = a; $\quad$ y = b; } void dClass::print()const { $\quad$ bClass:print(); $\quad$ cout << " " << z << endl; } $\quad$ dClass::dClass(int a,int b,int c) $\quad$$\quad$ : bClass(a,b) { $\quad$ Z = c; }

In ____________________ polymorphism,the (data)type is left unspecified and then later instantiated.

Existing classes,from which you create new classes,are called ____ classes.

If inheritance is public,all protected members of the base class are ____________________ members of the derived class.

Which of the following is a valid definition of the derived class bClass?

C++ provides ____ functions as a means to implement polymorphism in an inheritance hierarchy,which allows the run-time selection of appropriate member functions.

In OOD,a program is a collection of interacting ____________________; in structured programming,a program is a collection of interacting functions.

In protected inheritance,public and protected members of the base class become the protected members of the derived class.