构造和析构函数的实例.txt

最后声明

#include<iostream>
using namespace std;
class Student
{
public:
   Student(int StudentNo=0)
   {
    cout<<"creat one student\n";
    NoOfStudents++;

   cout<<"NoOfStudent "<<NoOfStudents;
   StudentNo=9022100+NoOfStudents;
   cout<<" StudentNo"<<StudentNo<<endl;
}
~Student()
{
cout<<"destruct one student \n";
NoOfStudents--;
}

static int number()
{
return NoOfStudents;
}
protected:
static int NoOfStudents;
int StudentNo;
};

int Student::NoOfStudents=0;

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

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