1.cpp

来自「一、教学目的： 能理解C++中运算符重载的需要性」· C++ 代码 · 共 40 行

#include<iostream.h>          
#include<string>

class Student
{
public:
      Student(char*pName="no name")
	  {
		  cout<<"Create one student\n";
		  strcpy(name,pName);
		  noOfStudent++;//静态成员：每创建一个对象，学生人数增1
		  cout<<noOfStudent<<endl;
	  }
	  ~Student()
	  {
		  cout<<"Destruct one student\n";
          noOfStudent--;//每析构一个对象，学生人数减1
		  cout<<noOfStudent<<endl;
	  }
	  static int number()//静态成员函数
      {
		  return noOfStudent;
	  }
protected:
	static int noOfStudent;
	char name[40];
};
int Student::noOfStudent=0;

void fn()
{
	Student s1;
	Student s2;
	cout<<Student::number()<<endl;
}
void main()
{
	fn();
	cout<<Student::number()<<endl;
}