text: /*
  
  // Fig. 12.9: Employee.h
  // Employee abstract base class.
  #ifndef EMPLOYEE_H
  #define EMPLOYEE_H
  
  #include <string> // C++ standard string class
  
  class Employee 
  {
  public:
     Employee( const std::string &, const std::string &, 
        const std::string & );
     virtual ~Employee() { } // virtual destructor
  
     void setFirstName( const std::string & ); // set first name
     std::string getFirstName() const; // return first name
  
     void setLastName( const std::string & ); // set last name
     std::string getLastName() const; // return last name
  
     void setSocialSecurityNumber( const std::string & ); // set SSN
     std::string getSocialSecurityNumber() const; // return SSN
  
     // pure virtual function makes Employee abstract base class
     virtual double earnings() const = 0; // pure virtual
     virtual void print() const; // virtual
  private:
     std::string firstName;
     std::string lastName;
     std::string socialSecurityNumber;
  }; // end class Employee
  
  #endif // EMPLOYEE_H
  
  */
  
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   * (C) Copyright 1992-2014 by Deitel & Associates, Inc. and               *
   * Pearson Education, Inc. All Rights Reserved.                           *
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