list0807.cpp

teach yourself C++ in 21 days 第五版

// Listing 8.7 - Pointers as data members
// accessed with -> operator
 
#include <iostream>

class SimpleCat
{
  public:
    SimpleCat();
    ~SimpleCat();
    int GetAge() const { return *itsAge; }
    void SetAge(int age) { *itsAge = age; }

    int GetWeight() const { return *itsWeight; }
    void setWeight (int weight) { *itsWeight = weight; }

  private:
    int * itsAge;
    int * itsWeight;
};

SimpleCat::SimpleCat()
{
   itsAge = new int(2);
   itsWeight = new int(5);
}

SimpleCat::~SimpleCat()
{
   delete itsAge;
   delete itsWeight;
}

int main()
{
   using namespace std;
   SimpleCat *Frisky = new SimpleCat;
   cout << "Frisky is " << Frisky->GetAge() 
             << " years old " << endl;
   Frisky->SetAge(5);
   cout << "Frisky is " << Frisky->GetAge() 
             << " years old " << endl;
   delete Frisky;
   return 0;
}