fig13_10.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 13.10: fig13_10.cpp
// Introducing polymorphism, virtual functions and dynamic binding.
#include <iostream>
using std::cout;
using std::endl;
using std::fixed;

#include <iomanip>
using std::setprecision;

// include class definitions
#include "CommissionEmployee.h"
#include "BasePlusCommissionEmployee.h" 

int main()
{
   // create base-class object
   CommissionEmployee commissionEmployee( 
      "Sue", "Jones", "222-22-2222", 10000, .06 );

   // create base-class pointer
   CommissionEmployee *commissionEmployeePtr = 0;

   // create derived-class object
   BasePlusCommissionEmployee basePlusCommissionEmployee(
      "Bob", "Lewis", "333-33-3333", 5000, .04, 300 );

   // create derived-class pointer
   BasePlusCommissionEmployee *basePlusCommissionEmployeePtr = 0;

   // set floating-point output formatting
   cout << fixed << setprecision( 2 );

   // output objects using static binding
   cout << "Invoking print function on base-class and derived-class "
      << "\nobjects with static binding\n\n";
   commissionEmployee.print(); // static binding
   cout << "\n\n";
   basePlusCommissionEmployee.print(); // static binding
   
   // output objects using dynamic binding
   cout << "\n\n\nInvoking print function on base-class and "
      << "derived-class \nobjects with dynamic binding";

   // aim base-class pointer at base-class object and print
   commissionEmployeePtr = &commissionEmployee;
   cout << "\n\nCalling virtual function print with base-class pointer"
      << "\nto base-class object invokes base-class "
      << "print function:\n\n";
   commissionEmployeePtr->print(); // invokes base-class print

   // aim derived-class pointer at derived-class object and print
   basePlusCommissionEmployeePtr = &basePlusCommissionEmployee;
   cout << "\n\nCalling virtual function print with derived-class "
      << "pointer\nto derived-class object invokes derived-class "
      << "print function:\n\n";
   basePlusCommissionEmployeePtr->print(); // invokes derived-class print

   // aim base-class pointer at derived-class object and print
   commissionEmployeePtr = &basePlusCommissionEmployee;
   cout << "\n\nCalling virtual function print with base-class pointer"
      << "\nto derived-class object invokes derived-class "
      << "print function:\n\n";

   // polymorphism; invokes BasePlusCommissionEmployee's print;
   // base-class pointer to derived-class object
   commissionEmployeePtr->print();
   cout << endl;
   return 0;
} // end main


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