1 #include 
     
       2 #include 
      
        3 using namespace std; 4 class Point{ 5 public: 6     Point(int newX=0,int newY=0){ 7         cout << "calling constructor" << endl; 8         x=newX; 9         y=newY;10     }11     Point(Point &p){12         x=p.x;13         y=p.y;14     }15     ~Point(){16         cout << "calling destructor " << endl;17     }18     void move(int x,int y){19         this->x+=x;20         this->y+=y;21     }22     int getX() {23         return x;24     }25     int getY() {26         return y;27     }28 private:29     int x,y;30 };31 class PointsArray{32 public:33     PointsArray(int size):size(size){34      array=new Point[size];  35     }36     Point &getElement(int index){37         if(index>=0&&index
       
        >n;56     PointsArray pa(n);57     cout<
        
         <<" "<
         
          <
         
        
       
      
     

输出结果：

　　　　calling constructor

　　　　calling destructor

动态内存分配：

new 数据类型（初始化形参列表）

int *point = new int;   //没有初值

int *point =new int(); //初值为0

int *a=new int[n];