3.cpp

一、教学目的： 能理解C++中运算符重载的需要性

#include<iostream.h>          

class Student
{
public:
	static int noOfStudents;
	Student& nextStudent()
	{
		noOfStudents++;
		return *this;
	}
      Student()
	  {
		  cout<<"Create one student\n";
		  noOfStudents++;//静态成员：每创建一个对象，学生人数增1
		  cout<<noOfStudents<<endl;
	  }
	  ~Student()
	  {
		  cout<<"Destruct one student\n";
          noOfStudents--;//每析构一个对象，学生人数减1
		  cout<<noOfStudents<<endl;
	  }
};
int Student::noOfStudents=0;

void fn(Student& s)
{
	cout<<s.nextStudent().noOfStudents<<endl;
}
void main()
{
	Student ss;
	fn(ss);
}