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14:
15: class Dog : public Mammal
16: {
17: public:
18: void Speak()const { cout << Woof!\n; }
19: };
20:
21: class Cat : public Mammal
22: {
23: public:
24: void Speak()const { cout << Meow!\n; }
25: };
26:
27: void ValueFunction (Mammal);
28: void PtrFunction (Mammal*);
29: void RefFunction (Mammal&);
30: int main()
31: {
32: Mammal* ptr=0;
33: int choice;
34: while (1)
35: {
36: bool fQuit = false;
37: cout << (1)dog (2)cat (0)Quit: ;
38: cin >> choice;
39: switch (choice)
40: {
41: case 0: fQuit = true;
42: break;
43: case 1: ptr = new Dog;
44: break;
45: case 2: ptr = new Cat;
46: break;
47: default: ptr = new Mammal;
48: break;
49: }
50: if (fQuit)
51: break;
52: PtrFunction(ptr);
53: RefFunction(*ptr);
54: ValueFunction(*ptr);
55: }
56: return 0;
57: }
58:
59: void ValueFunction (Mammal MammalValue)
60: {
61: MammalValue.Speak(); |
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continues |
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