?? list1503.cpp
字號(hào):
//Listing 15.3 private static data members
#include <iostream>
using std::cout;
using std::endl;
class Cat
{
public:
Cat(int age):itsAge(age){HowManyCats++; }
virtual ~Cat() { HowManyCats--; }
virtual int GetAge() { return itsAge; }
virtual void SetAge(int age) { itsAge = age; }
virtual int GetHowMany() { return HowManyCats; }
private:
int itsAge;
static int HowManyCats;
};
int Cat::HowManyCats = 0;
int main()
{
const int MaxCats = 5; int i;
Cat *CatHouse[MaxCats];
for (i = 0; i < MaxCats; i++)
CatHouse[i] = new Cat(i);
for (i = 0; i < MaxCats; i++)
{
cout << "There are ";
cout << CatHouse[i]->GetHowMany();
cout << " cats left!\n";
cout << "Deleting the one that is ";
cout << CatHouse[i]->GetAge()+2;
cout << " years old" << endl;
delete CatHouse[i];
CatHouse[i] = 0;
}
return 0;
}
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