derived.cpp

经典vc教程的例子程序

// Fig. 9.11: derived.cpp
// Member function definitions for class Derived
#include <iostream.h>
#include "derived.h"

// Constructor for Derived calls constructors for
// class Base1 and class Base2.
// Use member initializers to call base-class constructors
Derived::Derived( int i, char c, double f )
   : Base1( i ), Base2( c ), real ( f ) { } 

// Return the value of real
double Derived::getReal() const { return real; }

// Display all the data members of Derived
ostream &operator<<( ostream &output, const Derived &d )
{
   output << "    Integer: " << d.value 
          << "\n  Character: " << d.letter
          << "\nReal number: " << d.real;

   return output;   // enables cascaded calls
}