定义一个学生类

#include <iostream>
#include<string>
using namespace std;
class student;
class teacher
{
	float num;
	string name;
public:
	teacher(float num1,string name1);
	void set(student &s);
	void show();
};
class student
{
	float num,score;
	string name;
public:
	student(string name1,float num1,float score1);
	void show();
	friend void teacher::set(student &s);
};

student::student(string name1,float num1,float score1)
{
	name=name1;
	num=num1;
	score=score1;
}
void student::show()
{
	cout<<"学生学号:"<<num<<endl;
	cout<<"学生姓名:"<<name<<endl;
	cout<<"学生成绩:"<<score<<endl;
}
teacher::teacher(float num1,string name1)
{
	num=num1;
	name=name1;
}
void teacher::show()
{
	cout<<"教师职工号:"<<num<<endl;
	cout<<"教师姓名:"<<name<<endl;
}
void teacher::set(student &s)
{
	cout<<"请输入学号:"<<endl;
	cin>>s.num;
	cout<<"请输入姓名:"<<endl;
	cin>>s.name;
	cout<<"请输入成绩:"<<endl;
	cin>>s.score;
}
int main()
{
	student stu1("aaa",1,95);
		student stu2("bbb",2,93);
		stu1.show();
		cout<<"***********************"<<endl;
		stu2.show();
		teacher t(11111,"tttt");
	    cout<<"***********************"<<endl;
        t.show();
        cout<<"***********************"<<endl;
		t.set(stu2);
     	cout<<"***********************"<<endl;
		stu2.show();
		return 0;
}

定义一个学生类