[C/C++] C++類別成員覆蓋性(3)

#include <iostream>
using namespace std;

class CA{
  public:
     CA(){a=2; b=3; c=4; }
     int a, b, c;
};

class CB: public CA{
  public:
     CB(){ a=100; b=200;}
     int a, b;      // 可以覆蓋覆類別
     int getX(){ return a*b; }
     int getY(){ return CA::a*CA::b*c; }    // 若要使用父類別
};

int main()
{
  CB b;
  cout<< "a*b= "<< b.getX()<< endl;
  cout<< "a*b= "<< b.getY()<< endl;
  b.a = 1;
  b.CA::a = 5;
  b.c = 2;
  cout<< "a*b= "<< b.getX()<< endl;
  cout<< "a*b= "<< b.getY()<< endl;
  return 0;
}