Exercise 1:

Given the following class definitions:

class X {

public:

int b;

X( ) { a = b = c = 0;}

void print( ) { cout << a << b << c;}

protected:

int c;

private:

int a;

};

class Y : public X {

protected:

int d;

private:

int e;

public:

Y( ) : X() { d = e = 0; }

void print() { cout << d << e;}

};

(1) Let x be an object of class X and y be an object of class Y, list data members in objects x and y:

(2) In class Y, can we change the value of the variable c?

Can we print out the value of c in class Y?

Which variables’ values cannot be printed out in class Y?

Modify definition of class Y such that we can print all the values of its data members.

(3) Let Z be a class defined as:

class Z : protected Y {

};

and let z be an object of class Z. List all the data members in z with their access permissions.

(4) Modify the definition of class Z in (3) by adding a constructor to initialize all data members and a print function to print out all data members of Z.

Exercise 2:

Given the following class definitions:

class X {

public:

X( ) { a = b = c = 0;}

void print( ) { cout << a << b << c;}

protected:

int c;

private:

int a, b;

};

class Y : public X {

protected:

int d;

private:

int e;

public:

Y( ) : X() { d = e = 0; }

void print( ) { cout << d << e; }

};

Based on the following function f:

(a) identify and mark out statements that are invalid.

(b) show what are printed based on valid statements only.

void f( )

{

X x, *px;

Y y, *py;

px = &y;

py = &x;

x.c = 2;

x.b = 2;

y.d = 3;

y.c = 2;

y.b= 1;

x.print();

y.print();

py->c = 5;

px->e = 1;

px->b = 3;

px->print();

py->print();

}