C++面向对象程序设计第七章(2)

C++面向对象程序设计

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// Fig. 13.3: BasePlusCommissionEmployee.h // BasePlusCommissionEmployee class derived from class // CommissionEmployee. #ifndef BASEPLUS_H #define BASEPLUS_H #include <string> // C++ standard string class std::string; using std::string;

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BasePlus Commission Employee.h

10 #include "CommissionEmployee.h" // CommissionEmployee class declaration 11 12 class BasePlusCommissionEmployee : public CommissionEmployee 13 { 14 public: public: 15 16 17 18 19 20 21 22 24 26 27 #endif const; double earnings() const; // calculate earnings const; void print() const; // print BasePlusCommissionEmployee object double baseSalary; // base salary void setBaseSalary( double ); // set base salary const; double getBaseSalary() const; // return base salary BasePlusCommissionEmployee( const string &, const string &, 0.0, 0.0, const string &, double = 0.0, double = 0.0, double = 0.0 );

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23 private: private: 25 }; // end class BasePlusCommissionEmployee

C++面向对象程序设计

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// Fig. 13.4: BasePlusCommissionEmployee.cpp member// Class BasePlusCommissionEmployee member-function definitions. #include <iostream> using std::cout; // BasePlusCommissionEmployee class definition "BasePlusCommissionEmployee.h" #include "BasePlusCommissionEmployee.h"

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9 // constructor 10 BasePlusCommissionEmployee::BasePlusCommissionEmployee( 11 const string &first, const string &last, const string &ssn, 12 double sales, double rate, double salary ) 13 baseconstructor // explicitly call base-class constructor 14 : CommissionEmployee( first, last, ssn, sales, rate ) 15 { 16 setBaseSalary( salary ); // valida

te and store base salary 17 } // end BasePlusCommissionEmployee constructor 18 19 // set base salary 20 void BasePlusCommissionEmployee::setBaseSalary( double salary ) BasePlusCommissionEmployee::setBaseSalary( 21 { 22 baseSalary = ( salary < 0.0 ) ? 0.0 : salary; 23 } // end function setBaseSalary 24 25 26 27 28 29 // return base salary double BasePlusCommissionEmployee::getBaseSalary() const { baseSalary; return baseSalary; } // end function getBaseSalary

BasePlus Commission Employee.cpp

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C++面向对象程序设计

30 31 // calculate earnings 32 double BasePlusCommissionEmployee::earnings() const 33 { 34 36 37 // print BasePlusCommissionEmployee object 38 void BasePlusCommissionEmployee::print() const 39 { 40 41 42 43 44 45 cout << "\nbase salary: " << getBaseSalary(); 46 } // end function print print // invoke CommissionEmployee's print function CommissionEmployee::print(); "base"; cout << "base-salaried "; return getBaseSalary() + CommissionEmployee::earnings(); 35 } // end function earnings

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BasePlus Commission Employee.cpp

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C++面向对象程序设计

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// Fig. 13.5: fig13_05.cpp basederivedbase// Aiming base-class and derived-class pointers at base-class derived// and derived-class objects, respectively. #include <iostream> using std::cout; using std::endl; using std::fixed;

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fig13_05.cpp

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10 using std::setprecision; 12 // include class definitions 13 #include "CommissionEmployee.h" 14 #include "BasePlusCommissionEmployee.h" 15 16 int main() 17 { 18 19 20 21 22 23 base// create base-class pointer CommissionEmployee *commissionEmployeePtr = 0; base// create base-class object commissionEmployee( CommissionEmployee commissionEmployee( "Sue", "Jones", "222-22-2222", 10000, "Sue", "Jones", "222-22-2222", 10000, .06 );

C++面向对象程序设计

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 basebase// aim base-class pointer at base-class object and print commissionEmployeePtr = &commissionEmployee; // perfectly natural basecout << "\n\n\nCalling print with base-class pointer to " nbasebasefunction:\ n"; << "\nbase-class object invokes base-class print function:\n\n"; commissionEmployeePtrbasecommissionEmployeePtr->print(); // invokes base-class print // output objects commissionEmployee and basePlusCommissionEmployee basederived-class objects:\ n"; cout << "Print base-class and derived-class objects:\n\n"; basecommissionEmployee.print(); // invokes base-class print n"; cout << "\n\n"; derivedbasePlusCommissionEmployee.print(); // invokes derived-class print floating// set floating-point output formatting cout << fixed << setprecision( 2 ); derived// create derived-class pointer *basePlusCommissionEmployeePtr BasePlusCommissionEmployee *basePlusCommissionEmployeePtr = 0; derived// create derived-class object BasePlusCommissionEmployee basePlusCommissionEmployee( "Bob", "Lewis", "333-33-3333", 5000, .04, "Bob", "Lewis", "333-33-3333", 5000, .04, 300 );

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fig13_05.cpp

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C++面向对象程序设计

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53 54 55 56 57 58 59 60 61 basederived// aim base-class pointer at derived-class object and print commissionEmployeePtr commissionEmployeePtr = &basePlusCommissionEmployee; basecout << "\n\n\nCalling print with base-class pointer to " "derivedobject\ base<< "derived-class object\ninvokes base-class print " derivedobject:\ n"; << "function on that derived-class object:\n\n"; commissionEmployeePtrbasecommissionEmployeePtr->print(); // invokes base-class print yeePtr cout << endl; return 0; derivedderived// aim derived-class pointer at derived-class object and print basePlusCommis …… 此处隐藏：4166字，全部文档内容请下载后查看。喜欢就下载吧 ……