how to use an access declaration : private inheritance « Class « C++ Tutorial

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C++ Tutorial » Class » private inheritance 
9.12.2.how to use an access declaration
#include <iostream>   
     using namespace std;

  class B_class {   
  public:   
    int i, j;   
  };   
       
  class D_class : private B_class {   
  public:   
    // access declaration   
    B_class::i;  // i from B_class is now public again   
       
    int k;   
  ;   
       
  main(void)   
  {   
    D_class d;   
       
    d.i = 10;  // legal because i is made public in D_class   
    d.k = 20;   
       
    cout << d.i * d.k;   
       
    return 0;   
  }
9.12.private inheritance
9.12.1.Inherit base as private
9.12.2.how to use an access declaration
9.12.3.Granting Access: Inherit base as private
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