C++ Class Inheritance public and private derived classes

#include <iostream>
using namespace std;
class A                  //base class
{
   private://  w  w w  . ja v a 2s .  com
   int privdataA;     //(functions have the same access
   protected:            //rules as the data shown here)
   int protdataA;
   public:
   int pubdataA;
};
class B : public A       //publicly-derived class
{
   public:
   void funct()
   {
      int a;
      a = privdataA;  //error: not accessible
      a = protdataA;  //OK
      a = pubdataA;   //OK
   }
};
class C : private A      //privately-derived class
{
   public:
   void funct()
   {
      int a;
      a = privdataA;  //error: not accessible
      a = protdataA;  //OK
      a = pubdataA;   //OK
   }
};
int main()
{
   int a;
   B objB;
   a = objB.privdataA;   //error: not accessible
   a = objB.protdataA;   //error: not accessible
   a = objB.pubdataA;    //OK (A public to B)
   C objC;
   a = objC.privdataA;   //error: not accessible
   a = objC.protdataA;   //error: not accessible
   a = objC.pubdataA;    //error: not accessible (A private to C)
   return 0;
}