text: // Fig. 21.3: BasePlusCommissionEmployee.h
  // BasePlusCommissionEmployee class derived from class 
  // CommissionEmployee.
  #ifndef BASEPLUS_H
  #define BASEPLUS_H
  
  #include <string> // C++ standard string class
  #include "CommissionEmployee.h" // CommissionEmployee class declaration
  using namespace std;
  
  class BasePlusCommissionEmployee : public CommissionEmployee
  {
  public:
     BasePlusCommissionEmployee( const string &, const string &, 
        const string &, double = 0.0, double = 0.0, double = 0.0 );
     
     void setBaseSalary( double ); // set base salary
     double getBaseSalary() const; // return base salary
  
     double earnings() const; // calculate earnings
     void print() const; // print BasePlusCommissionEmployee object
  private:
     double baseSalary; // base salary
  }; // end class BasePlusCommissionEmployee
  
  #endif
  
  
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