fig13_05.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. 13.5: fig13_05.cpp
// Aiming base-class and derived-class pointers at base-class
// and derived-class objects, respectively.
#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 commissionEmployee and basePlusCommissionEmployee
   cout << "Print base-class and derived-class objects:\n\n";
   commissionEmployee.print(); // invokes base-class print
   cout << "\n\n";
   basePlusCommissionEmployee.print(); // invokes derived-class print
   
   // aim base-class pointer at base-class object and print
   commissionEmployeePtr = &commissionEmployee; // perfectly natural
   cout << "\n\n\nCalling print with base-class pointer to "
      << "\nbase-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; // natural
   cout << "\n\n\nCalling print with derived-class pointer to "
      << "\nderived-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\n\nCalling print with base-class pointer to "
      << "derived-class object\ninvokes base-class print "
      << "function on that derived-class object:\n\n";
   commissionEmployeePtr->print(); // invokes base-class print
   cout << endl;
   return 0;
} // end main


/**************************************************************************
 * (C) Copyright 1992-2005 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 **************************************************************************/