关于析构的时间问题？？？

[ljx1678]

我想显性的表示出对象何时被析构，但是在VC6。0上根本没有办法这样。而在VC2008上的结果也无法解释。大家帮我看看呀。
下面是代码：
#if!defined _POINT_H
#include <iostream>
#include <math.h>

using namespace std;

class Point{
private:double x,y;

public:Point(){}
~Point();
void set();
void display();
static double lenth(const Point & ,const Point &);
};

void Point::set ()
{
int a,b;
char c;
cout << "please input x and y:";
cin >> a ;
c=getchar();
cin >> b ;
x=a;
y=b;
}

Point::~Point ()
{
cout << "P(" << x <<","<<y<< ")" << "has been deleted." << endl;
}
void Point::display()
{
cout << "(" << x <<"," << y << ")" << " ";
}

double Point::lenth(const Point & P1,const Point & P2 )
{
double lenth;
lenth=pow((pow(P1.x-P2.x,2)+pow(P1.y-P2.y,2)),0.5);
return lenth;
}

#endif




#include <iostream>
#include "point.h"


using namespace std;

int main()
{
Point* ptp;
ptp = new Point[10];
for(int i=0;i<10;i++)
{
cout << "P" << i+1 << ":";
ptp[i].set ();
}
cout << endl;
cout << "ten points:";
for(int j=0;j<10;j++)
{
ptp[j].display ();
}
cout << endl;
double lenth=0;
for(int k=0;k<9;k++)
{
lenth+=Point::lenth (ptp[k],ptp[k+1]);
}
cout << "the lenth of the lines connecting this ten points is " << lenth << endl;
return 0;
}

[mengde007]

#include <iostream>
#include <math.h>

using namespace std;

class Point
{
private:
	double x,y;

public:
	Point(){}
  ~Point();
  void set();
      void display();
  static double lenth(const Point & ,const Point &);
};

void Point::set ()
{
int a,b;
char c;
cout << "please input x and y:";
cin >> a ;
c=getchar();
cin >> b ;
x=a;
y=b;
}

Point::~Point ()
{
cout << "P(" << x <<"," <<y << ")" << "has been deleted." << endl;
}
void Point::display()
{
cout << x <<"," << y << " ";
}

double Point::lenth(const Point & P1,const Point & P2 )
{
double lenth;
lenth=pow((pow(P1.x-P2.x,2)+pow(P1.y-P2.y,2)),0.5);
return lenth;
}


#include <iostream>
using namespace std;
int main()
{

	Point* ptp;

	ptp = new Point[10];

	for(int i=0;i <10;i++)

	{

		cout << "P" << i+1 << ":";

		ptp[i].set ();

	}
    cout << endl;

	cout << "ten points:";

	for(int j=0;j <10;j++)

	{

		ptp[j].display ();

	}

	cout << endl;

	double lenth=0;

	for(int k=0;k <9;k++)

	{

		lenth+=Point::lenth (ptp[k],ptp[k+1]);

	}
	cout << "the lenth of the lines connecting this ten points is " << lenth << endl;

	delete []ptp;//楼主没有调用析构啊，显式的。
	return 0;
} 

[xqls_xqls]

delete []ptp;

[zwzzwz1]

//Point.H
#ifndef _POINT_H
#define _POINT_H 
#include <iostream> 
#include <math.h> 

using namespace std; 

class Point{ 
private:double x,y; 

public:Point(){} 
  ~Point(); 
  void set(); 
      void display(); 
  static double lenth(const Point & ,const Point &); 
}; 

void Point::set () 
{ 
int a,b; 
char c; 
cout << "please input x and y:"; 
cin >> a ; 
c=getchar(); 
cin >> b ; 
x=a; 
y=b; 
} 

Point::~Point () 
{ 
cout << "P(" << x <<"," <<y << ")" << "has been deleted." << endl; 
} 
void Point::display() 
{ 
cout << "(" << x <<"," << y << ")" << " "; 
} 

double Point::lenth(const Point & P1,const Point & P2 ) 
{ 
double lenth; 
lenth=pow((pow(P1.x-P2.x,2)+pow(P1.y-P2.y,2)),0.5); 
return lenth; 
} 

#endif

//main.cpp
#include <iostream> 
#include "Point.h" 


using namespace std; 

int main() 
{ 
Point* ptp; 
ptp = new Point[10]; 
for(int i=0;i <10;i++) 
{ 
cout << "P" << i+1 << ":"; 
ptp[i].set (); 
} 
    cout << endl; 
cout << "ten points:"; 
for(int j=0;j <10;j++) 
{ 
ptp[j].display (); 
} 
cout << endl; 
double lenth=0; 
for(int k=0;k <9;k++) 
{ 
lenth+=Point::lenth (ptp[k],ptp[k+1]); 
} 
cout << "the lenth of the lines connecting this ten points is " << lenth << endl; 
delete[] ptp;  // 楼主用new忘记释放了.
return 0; 
} 

[ljx1678]

没有delete []ptp;应该也可以把，我用VS2008是又显示出析构的，可是析构的时间好像有点问题。