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/* *Copyright(c) 2016,烟台大学计算机学院 *作 者:刘金石 *完成日期:2016年5月10日 *问题描述: (1)定义一个名为CPerson的类,有以下私有成员:姓名、身份证号、性别和年龄, 成员函数:构造函数、析构函数、输出信息的函数。并在此基础上派生出CEmployee类, 派生类CEmployee增加了两个新的数据成员,分别用于表示部门和薪水。要求派生类 CEmployee的构造函数显示调用基类CPerson的构造函数,并为派生类CEmployee定义 析构函数,定义输出信息的函数。 */ #include<iostream> #include<iomanip> using namespace std; class CPerson { protected: string m_szName; string m_szId; int m_nSex;//0:women,1:man int m_nAge; public: CPerson(string name,string id,int sex,int age); void Show1(); ~CPerson(); }; CPerson::~CPerson(){} CPerson::CPerson(string name,string id,int sex,int age):m_szName(name),m_szId(id),m_nSex(sex), m_nAge(age){} void CPerson::Show1() { cout<<setw(10)<<m_szName<<setw(25)<<m_szId; if(m_nSex==0) cout<<setw(7)<<"women"; else cout<<setw(7)<<"man"; cout<<setw(5)<<m_nAge<<endl; } class CEmployee:public CPerson { private: string m_szDepartment; double m_Salary; public: CEmployee(string name,string id,int sex,int age,string department,double salary); void Show2(); ~CEmployee(); }; CEmployee:: CEmployee(string name,string id,int sex,int age,string department,double salary): CPerson(name,id,sex,age),m_szDepartment(department),m_Salary(salary){} void CEmployee::Show2() { cout<<setw(10)<<"name"<<setw(25)<<"id"<<setw(7)<<"sex"<<setw(5)<<"age"<<setw(12)<<"department"<<setw(10)<<"salary"<<endl; cout<<setw(10)<<m_szName<<setw(25)<<m_szId; if(m_nSex==0) cout<<setw(7)<<"women"; else cout<<setw(7)<<"man"; cout<<setw(5)<<m_nAge; //由于基类CPerson的成员变量采用了protected属性,因此可采用上述述代码实现,否则若 //基类CPerson的成员变量采用了privated属性,则只能使用CPerson::Show1();实现 cout<<setw(12)<<m_szDepartment<<setw(10)<<m_Salary<<endl; } CEmployee::~CEmployee() {} int main() { string name,id,department; int sex,age; double salary; cout<<"input employee's name,id,sex(0:women,1:man),age,department,salary:\n"; cin>>name>>id>>sex>>age>>department>>salary; CEmployee employee1(name,id,sex,age,department,salary); employee1.Show2(); return 0; }
运行结果:
/* (2)字符串除了用C++扩充的string类型外,按C语言的传统, 还可以用char *表示。请将类声明中的string全部改为char *后, 重新写一遍程序(此时的区别是,类中有指针成员,构造和 析构函数需要考虑深复制的问题了。) */ #include<iostream> #include<iomanip> #include<string.h> using namespace std; class CPerson { protected: char * m_szName; char * m_szId; int m_nSex;//0:women,1:man int m_nAge; public: CPerson(char * name,char * id,int sex,int age); void Show1(); ~CPerson(); }; CPerson::~CPerson(){} CPerson::CPerson(char * name,char * id,int sex,int age) { m_szName=new char[strlen(name)+1]; strcpy(m_szName,name); m_szId=new char[strlen(id)+1]; strcpy(m_szId,id); m_nSex=sex; m_nAge=age; } void CPerson::Show1() { cout<<setw(10)<<m_szName<<setw(25)<<m_szId; if(m_nSex==0) cout<<setw(7)<<"women"; else cout<<setw(7)<<"man"; cout<<setw(5)<<m_nAge<<endl; } class CEmployee:public CPerson { private: char * m_szDepartment; double m_Salary; public: CEmployee(char * name,char * id,int sex,int age,char * department,double salary); void Show2(); ~CEmployee(); }; CEmployee:: CEmployee(char * name,char * id,int sex,int age,char * department,double salary): CPerson(name,id,sex,age),m_Salary(salary) { m_szDepartment=new char[strlen(department)+1]; strcpy(m_szDepartment,department); } void CEmployee::Show2() { cout<<setw(10)<<"name"<<setw(25)<<"id"<<setw(7)<<"sex"<<setw(5)<<"age"<<setw(12)<<"department"<<setw(10)<<"salary"<<endl; cout<<setw(10)<<m_szName<<setw(25)<<m_szId; if(m_nSex==0) cout<<setw(7)<<"women"; else cout<<setw(7)<<"man"; cout<<setw(5)<<m_nAge; //由于基类CPerson的成员变量采用了protected属性,因此可采用上述述代码实现,否则若 //基类CPerson的成员变量采用了privated属性,则只能使用CPerson::Show1();实现 cout<<setw(12)<<m_szDepartment<<setw(10)<<m_Salary<<endl; } CEmployee::~CEmployee() {} int main() { char * name,*id,*department; int sex,age; double salary; name=new char[10]; id=new char[19]; department=new char[10]; cout<<"input employee's name,id,sex(0:women,1:man),age,department,salary:\n"; cin>>name>>id>>sex>>age>>department>>salary; CEmployee employee1(name,id,sex,age,department,salary); employee1.Show2(); return 0; }运行结果:
同上
学习心得:
对于子类的深复制,如果基类的构造函数中已经为变量完成了深复制,那么在子类的构造函数中就不需要为继承过来的变量进行深复制,只需要为增加的指针变量深复制即可。
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原文地址:http://blog.csdn.net/november_chopin/article/details/51366204