设计老师类和学生类。每个老师有姓名和研究方向，还可以指导若干个研究生。研究生的私有数据成 员包括姓名，专业和学号；编写一个程序，创建包含三个教师的数组。输入每个老师的指导所有研究 生的信息，输出所有教_设计子类collegeteacher.要求添加新的私有属性:研究方向、

设计老师类和学生类。每个老师有姓名和研究方向，还可以指导若干个研究生。研究生的私有数据成
员包括姓名，专业和学号；编写一个程序，创建包含三个教师的数组。输入每个老师的指导所有研究
生的信息，输出所有教师的相关信息，包括指导学生情况。注意：要求不能使用友元函数！

#include<iostream>
#include<cstring>
using namespace std;

class Student
{
public:
	Student(char*name_,char* major_,int id_);
	Student();
	~Student();
	void Setstudent();
	void show();
private:
	char* name;
	char* major;
	int id;
};

class Teacher
{
public:
	Teacher(char* name_, char* major_, int n_);
	Teacher();
	~Teacher();
	void show();
private:
	char* name;
	char* major;
	Student* student;
	int n;
};

Student::Student(char* name_, char* major_, int id_):id(id_)
{
	name = new char[20];
	strcpy(name, name_);
	major = new char[20];
	strcpy(major, major_);
}

Student::Student(){
	name = new char[20];
	major = new char[20];
	id = 0;
}

Student::~Student()
{
	delete[]name;
	delete[]major;
}

void Student::Setstudent() {
	cout << "Student's name:" << endl;
	cin >> name;
	cout << "major:" << endl;
	cin >> major;
	cout << "id:" << endl;
	cin >> id;
}

void Student::show() {
	cout << "Student's name:" << name << endl << "major:" << major << endl << "id:" << id << endl;
}

Teacher::Teacher(char* name_, char* major_, int n_):n(n_)
{
	name = new char[20];
	strcpy(name, name_);
	major = new char[20];
	strcpy(major, major_);
	student = new Student[n];
	for (int i = 0; i < n; i++) {
		student[i].Setstudent();
	}
}

Teacher::Teacher() {
	name = new char[20];
	cout << "Teacher's name:" << endl;
	cin >> name;
	major = new char[20];
	cout << "major:" << endl;
	cin >> major;
	cout << "How many students?" << endl;
	cin >> n;
	student = new Student[n];
	for (int i = 0; i < n; i++) {
		student[i].Setstudent();
	}
}

Teacher::~Teacher()
{
	delete[]name;
	delete[]major;
	delete[]student;
}

void Teacher::show() {
	cout << "Teacher's name:" << name << endl << "major:" << major << endl;
	for (int i = 0; i < n; i++) {
		student[i].show();
	}
}

int main() {
	Teacher t[3];
	for (int i = 0; i < 3; i++) {
		t[i].show();
	}
	return 0;
}
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