A base pointer to access derived objects

  

#include <iostream>
using namespace std;
class BaseClass {
  int i;
public:
  void setInt(int num) { 
    i = num; 
  }
  int getInt() { 
    return i; 
  }
};
class derived: public BaseClass {
  int j;
public:
  void setJ(int num) { 
     j = num; 
  }
  int getJ() { 
     return j; 
  }
};
int main()
{
  BaseClass *bp;
  derived d;
  bp = &d;                   // BaseClass pointer points to derived object
                             // access derived object using BaseClass pointer
  bp->setInt(10);
  cout << bp->getInt() << " ";

  return 0;
}

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A base pointer to access derived objects : Derived « Class « C++

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