用输出显示析构顺序

好的，请看以下代码实现：

#include <iostream>
#include <cmath>

using namespace std;

class Point {
public:
    double x, y;
    Point(double _x = 0, double _y = 0) : x(_x), y(_y) {
        cout << "构造函数被调用" << endl;
    }
    ~Point() {
        cout << "析构函数被调用" << endl;
    }
};

double distance(Point a, Point b) {
    double dx = a.x - b.x, dy = a.y - b.y;
    return sqrt(dx * dx + dy * dy);
}

int main() {
    int n;
    cout << "请输入点的个数n：";
    cin >> n;

    Point* points = new Point[n];
    cout << "请输入" << n << "个点的坐标：" << endl;
    for (int i = 0; i < n; i++) {
        cin >> points[i].x >> points[i].y;
    }

    cout << "这" << n << "个点的坐标为：" << endl;
    for (int i = 0; i < n; i++) {
        cout << "(" << points[i].x << ", " << points[i].y << ")" << endl;
    }

    double len = 0;
    for (int i = 1; i < n; i++) {
        len += distance(points[i-1], points[i]);
    }
    cout << "这" << n << "个点组成的折线长度为：" << len << endl;

    delete[] points;
    cout << "内存空间已被释放" << endl;

    return 0;
}

在这个代码中，我们在 Point 类中添加了一个析构函数，用来输出析构函数被调用的信息。在 main 函数中，我们在 delete 语句后面添加了一行输出语句，用来表示内存空间已被释放。这样，当程序运行时，我们就可以看到析构函数的调用顺序了。