第一章7.txt

本书在复习C++基础知识后

#include <iostream.h>
#include <string.h>
class CPerson
{
public:
		CPerson(char *name, int age, char sex = 'M')
		{
			strncpy(this->name, name, 20);
			this->age = age;	this->sex = sex;
		}
		void SetNameAndSex( char *name, char sex = 'M')	// 更改姓名和性别
		{
			strncpy(this->name, name, 20);
			this->sex = sex;	
		}
protected:
		void SetAge(int age)
		{
			this->age = age;	
		}
		void ShowInfo()							// 显示信息
		{
			cout<<"姓名："<<name<<endl;	
			cout<<"性别："<<(sex=='M'?"男":"女")<<endl;
			cout<<"年龄："<<age<<endl;
		}
private:
		char		name[20];						// 姓名
		char		sex;							// 性别
		int		age;							// 年龄
};
class CStudent :public CPerson
{
public:
		CStudent(char *name, char *no, int age, char sex = 'M')
			:CPerson(name, age, sex)				// 调用基类构造函数进行初始化		
		{
			strncpy(this->stuno, no, 20);
		}
		void SetScore( float s1, float s2, float s3 )
		{
			score[0] = s1;			score[1] = s2;			score[2] = s3;
			total = s1 + s2 + s3;		ave = total / (float)3.0;
		}
		void SetNoAndAge(char *no, int age)
		{
			strncpy(this->stuno, no, 20);	this->SetAge( age );
		}
		void ShowAll()
		{
			ShowInfo();						// 调用基类的成员函数
			cout<<"学号："<<stuno<<endl;
			cout<<"三门成绩："<<score[0]<<"\t"<<score[1]<<"\t"<<score[2]<<endl;
			cout<<"总成绩和平均分："<<total<<"\t"<<ave<<endl;
		}
private:
		char		stuno[20];						// 学号
		float		score[3],ave, total;		// 三门成绩、平均和总分
};
int  main()
{
		CStudent one("LiMing", "21050101", 19 );		// A
		one.SetScore( 90, 80, 84);			// B
		one.ShowAll();							// 调用派生类的公有成员函数
		one.SetNameAndSex("WangFang", 'W');		// 调用基类的公有成员函数
		one.SetNoAndAge("21050102", 18 );		// 调用派生类的公有成员函数
		one.ShowAll();							// 调用派生类的公有成员函数
		return 0;
}