定义一个Teacher（教师)类,和一个Student(学生)类

定义一个Teacher（教师)类,和一个Student(学生)类,二者有一部分数据成员是相同的，例如num（号码），name（姓名），sex（性别）。编写程序，将一个Student对象

转换为Teacher类，只将以上3个相同的数据成员移植过去，

#include<iostream>
#include<string>
using namespace std;
class Student;
class Teacher
{
public:
Teacher(){name="";num=0;sex="";}
Teacher(string a,int b,string c){name=a;num=b;sex=c;}
Teacher operator =(Student &b);
void display();
string name;
int num;
string sex;
};
void Teacher::display()
{
cout<<name<<" "<<num<<" "<<sex;
}
class Student
{
public:
Student(){name="";num=0;sex="";}
Student(string a,int b,string c){name=a;num=b;sex=c;}
void display();
string name;
int num;
string sex;
};
void Student::display()
{
cout<<name<<" "<<num<<" "<<sex;
}

Teacher Teacher::operator =(Student &b)
{

name=b.name;
num=b.num;
sex=b.sex;
return *this;
}

int main()
{
Teacher t1("张三",101,"女"),t2;
t1.display();
cout<<endl;
Student s1("李四",168,"男");
s1.display();
cout<<endl;
t2=s1;
t2.display();

}

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