fig13_07.cpp

来自「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」· C++ 代码 · 共 45 行

// Fig. 13.7: fig13_07.cpp
// Attempting to invoke derived-class-only member functions
// through a base-class pointer.
#include "CommissionEmployee.h"
#include "BasePlusCommissionEmployee.h"

int main()
{
   CommissionEmployee *commissionEmployeePtr = 0; // base class
   BasePlusCommissionEmployee basePlusCommissionEmployee(
      "Bob", "Lewis", "333-33-3333", 5000, .04, 300 ); // derived class
   
   // aim base-class pointer at derived-class object
   commissionEmployeePtr = &basePlusCommissionEmployee;

   // invoke base-class member functions on derived-class
   // object through base-class pointer
   string firstName = commissionEmployeePtr->getFirstName();
   string lastName = commissionEmployeePtr->getLastName();
   string ssn = commissionEmployeePtr->getSocialSecurityNumber();
   double grossSales = commissionEmployeePtr->getGrossSales();
   double commissionRate = commissionEmployeePtr->getCommissionRate();
   
   // attempt to invoke derived-class-only member functions
   // on derived-class object through base-class pointer
   double baseSalary = commissionEmployeePtr->getBaseSalary();
   commissionEmployeePtr->setBaseSalary( 500 );
   return 0;
} // end main

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