33: };
34:
35: class Pig : public Mammal
36: {
37: public:
38: void Speak()const { cout << “Oink!\n”; }
39: };
40:
41: int main()
42: {
43: Mammal* theArray[5];
44: Mammal* ptr;
45: int choice, i;
46: for ( i = 0; i<5; i++)
47: {
48: cout << “(1)dog (2)cat (3)horse (4)pig: “;
49: cin >> choice;
50: switch (choice)
51: {
52: case 1: ptr = new Dog;
53: break;
54: case 2: ptr = new Cat;
55: break;
56: case 3: ptr = new Horse;
57: break;
58: case 4: ptr = new Pig;
59: break;
60: default: ptr = new Mammal;
61: break;
62: }
63: theArray[i] = ptr;
64: }
65: for (i=0;i<5;i++)
66: theArray[i]->Speak();
67: return 0;
68: }(1)dog (2)cat (3)horse (4)pig: 1
(1)dog (2)cat (3)horse (4)pig: 2
(1)dog (2)cat (3)horse (4)pig: 3
(1)dog (2)cat (3)horse (4)pig: 4
(1)dog (2)cat (3)horse (4)pig: 5
Woof!
Meow!
Whinny!
Oink!
Mammal speak!OUTPUT
394 Day 12
LISTING12.9 continued