//ab.cpp -- @CopyLeft by tsaiwn@csie.nctu.edu.tw
// g++  -Wno-deprecated -ab.cpp
//test constructor/destructor and Inheritance
//Note that void test( ) is friend of class B
#include <iostream.h>   // so that can be run under TC++3.0
//using namespace std;
class A {
 protected: 
   int data;  
 public:
   A( ) { cout << "A ";  data = 38;}
   A(int k) { cout << "Aint "<<k<<" ";  data = k;}
  ~A( ) { cout << "A_"<<data<<" dying.."<<endl; }
   int getData( ) { return data; }
};
class B: public A {
 int kkk;
 public: B( ) { cout << "B ";  kkk=49;}
   B(int x):A(x*10) { kkk=x; cout << "Bint "<<kkk<<" ";  } 
   B(double x) { kkk=(int)x*100; cout << "BDBL "<<kkk<<" ";  } 
  ~B( ) { cout << "B_" << kkk<<" dying .."; }
   int getK( ) { return kkk; }
   friend void test( );  // claim that void test( ) is my friend
};
void test( ) {
  B x(33.555);  
  cout << " in test ... "; 
  cout << " x.kkk = " << x.kkk << endl;
  cout << " x.data = " << x.data << endl;
}
B yy;
extern B m;  // declare m ONLY
int main( ) {  
   A xxx(123);  B bb(1357);
   cout << "=== ===\n";   
   test( );
   cout << "\nNow do m=258; \n"; /// will invoke constructor, , destructor
   m=258;
   //cout << m.data;  // error because main( ) is NOT friend of B
   cout << " m.getK()=" << m.getK( ) << endl;
   cout << " m.getData()=" << m.getData( ) << endl;
   cout << "=== bye ..." << endl; 
}
B m(888);   // define m
/// end of the file