C++第11周项目3 - CEmployee类继承自CPerson类

课程首页地址：http://blog.csdn.net/sxhelijian/article/details/7910565，本周题目链接：http://blog.csdn.net/sxhelijian/article/details/8894095

【项目3】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。

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();  //需要释放建立对象时动态分配的内存
};


class CEmployee:public CPerson
{
private:
	char *m_szDepartment;
	float m_Salary;
public:
	CEmployee(char *name,char *id,int sex,int age,char *department,float salary);
	void Show2();
	~CEmployee();
};


int main()
{
	char name[10],id[19],department[10];
	int sex,age;
	float 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;
}

参考解答：

#include <iostream>
#include <string.h>
#include <iomanip>
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();
};

class CEmployee:public CPerson
{
private:
	char *m_szDepartment;
	float m_Salary;
public:
	CEmployee(char *name,char *id,int sex,int age,char *department,float salary);
	void Show2();
	~CEmployee();
};

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;	//setw:设置输出数据的宽度,使用时应#include <iomanip.h>
	if(m_nSex==0)
		cout<<setw(7)<<"women";
	else
		cout<<setw(7)<<"man";
	cout<<setw(5)<<m_nAge<<endl;
}

CPerson::~CPerson()
{
	delete [ ]m_szName;
	delete [ ]m_szId;
}

CEmployee::CEmployee(char *name,char *id,int sex,int age,char *department,float salary)
:CPerson(name,id,sex,age)
{
	m_szDepartment=new char[strlen(department)+1];
	strcpy(m_szDepartment,department);
	m_Salary=salary;
}

void CEmployee::Show2()//注意派生类输出函数应输出所有成员变量（含基类继承的成员变量）的值
{
	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::Show();实现
	cout<<setw(12)<<m_szDepartment<<setw(10)<<m_Salary<<endl;
}

CEmployee::~CEmployee()
{
	delete [ ]m_szDepartment;
}

int main()
{
	char name[10],id[19],department[10];
	int sex,age;
	float 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;
}