#include<iostream.h>
//定義一個(gè)含有static數(shù)據(jù)成員的類
class ex
{
    static int num;      //static數(shù)據(jù)成員
public:
    ex() {num++;}
    ~ex() {num--;}
    disp_count() {
       cout<<"The current instances count:";
       cout<<num<<endl;
    }
};
int ex::num=0;    //設(shè)置static數(shù)據(jù)成員的初值
//main()函數(shù)測試ex類
main()
{
    ex a;
    a.disp_count();

    ex *p;
    p=new ex;
    p->disp_count();

    ex x[10];
    x[0].disp_count();

    delete p;
    a.disp_count();
}