单继承简单应用

/****************************************************
* 文件名：
* 功能：单继承简单应用
* 说明：类的继承是面向对象程序设计的一个重要特征
        继承就是利用现有的类来定义新的类，新的类不仅能获得已有类的特性，而且还可以
        修改获得特性以及增加新的特性。
        初始化派生类的对象时，就要对基类数据成员、和子对象数据成员都进行初始化
* 时间：2011-3-30                  --Lzy
****************************************************/
//公在继承

#include <iostream.h>
#include <string.h>

class Student
{
private:
    char *name;
    int scoreNO;

public:
     Student (char *str = "", int sn = 1)        //构造函数

     {
        name = new char[strlen(str)+1];            //重新分配存储空间

        strcpy(name, str);                        //保存数据

        scoreNO = sn;
     }

     ~Student(){delete []name;}                    //释放数组内存单元

     char * getname(){return name;}
     int getScoreNO(){return scoreNO;}
};

class GraduateStudent:public Student
{
private:
    char *instructor;

public:
    GraduateStudent(char *str = "", int sn = 1, char *dstr = ""):Student (str, sn)
    {
        instructor = new char[strlen(dstr)+1];
        strcpy(instructor, dstr);
    }
    ~GraduateStudent(){delete []instructor;}
    char *getInstructor(){return instructor;}
};

void main()
{
    GraduateStudent Lzy("罗志勇", 19, "Lzy");
    cout<<Lzy.getname()<<'\t'<<Lzy.getScoreNO()<<'\t'<<Lzy.getInstructor()<<endl;
}

//私有继承

#include <iostream.h>
#include <string.h>

class Student
{
protected:
    char *name;
    int scoreNO;

public:
     Student (char *str = "", int sn = 1)        //构造函数

     {
        name = new char[strlen(str)+1];            //重新分配存储空间

        strcpy(name, str);                        //保存数据

        scoreNO = sn;
     }

     ~Student(){delete []name;}                    //释放数组内存单元

     char * getname(){return name;}
     int getScoreNO(){return scoreNO;}
};

class GraduateStudent:private Student
{
private:
    char *instructor;

public:
    GraduateStudent(char *str = "", int sn = 1, char *dstr = ""):Student (str, sn)
    {
        instructor = new char[strlen(dstr)+1];
        strcpy(instructor, dstr);
    }
    ~GraduateStudent(){delete []instructor;}
    char *getInstructor(){return instructor;}
     char * getname(){return name;}
     int getScoreNO(){return scoreNO;}
};

void main()
{
    GraduateStudent Lzy("罗志勇", 19, "Lzy");
    cout<<Lzy.getname()<<'\t'<<Lzy.getScoreNO()<<'\t'<<Lzy.getInstructor()<<endl;
}