将一个Student对象转换为Teacher对象

// 7、定义Teacher类和Student类,将Student类转换成Teacher类
#include<iostream>
using namespace std;
class Student; //提取引用申明
class Teacher
{
private:
int num;
char *name;
char *sex;
public:
Teacher()
{
num = 0;
name = NULL;
sex = NULL;
}
Teacher(int n, char *p, char *s)
{
num = n;
name = p;
sex = s;
}
Teacher(Student &s); //转换构造函数
void display()
{
cout << "号码：" << num << endl;
cout << "姓名：" << name << endl;
cout << "性别：" << sex << endl;
cout << endl;
}
};
class Student
{
private:
int num;
char *name;
char *sex;
public:
Student(int n, char *p, char *s)
{
num = n;
name = p;
sex = s;
}
friend Teacher; //将Teacher声明为Student的友元类，那么Teacher就可以访问Student的私有数据
void display()
{
cout << "号码：" << num << endl;
cout << "姓名：" << name << endl;
cout << "性别：" << sex << endl;
cout << endl;
}
};
Teacher::Teacher(Student &s) //转换构造函数
{
num = s.num;
name = s.name;
sex = s.sex;
}

int main()
{
Student s1(1001,"chenliqiong","female");
cout << "Student s1为：" << endl;
s1.display();

Teacher t1;
t1 = Teacher(s1);
cout << "移植后的Teacher t1为：" << endl;
t1.display();
return 0;
}

运行结果如下：