Special Classes and Functions 52913: int itsAge;^15
14: };
15:
16: class Dog : public Mammal
17: {
18: public:
19: void Speak()const { cout << “Woof!” << endl; }
20: void Move() const { cout << “Walking to heel...” << endl; }
21: };
22:
23:
24: class Cat : public Mammal
25: {
26: public:
27: void Speak()const { cout << “Meow!” << endl; }
28: void Move() const { cout << “slinking...” << endl; }
29: };
30:
31:
32: class Horse : public Mammal
33: {
34: public:
35: void Speak()const { cout << “Winnie!” << endl; }
36: void Move() const { cout << “Galloping...” << endl; }
37: };
38:
39:
40: int main()
41: {
42: void (Mammal::*pFunc)() const =0;
43: Mammal* ptr =0;
44: int Animal;
45: int Method;
46: bool fQuit = false;
47:
48: while (fQuit == false)
49: {
50: cout << “(0)Quit (1)dog (2)cat (3)horse: “;
51: cin >> Animal;
52: switch (Animal)
53: {
54: case 1: ptr = new Dog; break;
55: case 2: ptr = new Cat; break;
56: case 3: ptr = new Horse; break;
57: default: fQuit = true; break;
58: }
59: if (fQuit == false)
60: {
61: cout << “(1)Speak (2)Move: “;LISTING15.10 continued