#include<iostream>

#include<new>

const int buf();

int N();

char buffer[buf] = {};

using namespace std;

void main()

{

    double *p1, *p2;

    std::cout << "\n\n\n";

    p1 = new double[N];

    p2 = new (buffer)double[N];

    for (int i = ; i < N; i++)

    {

            p1[i] = p2[i] = i + 10.8;

            std::cout << "p1===   " << &p1[i] << "  " << p1[i];

            std::cout << "   p2===   " << &p2[i] << "  " << p2[i] << std::endl;

    }

    double *p3, *p4;

    std::cout << "\n\n\n";

    p3 = new double[N];

    p4 = new (buffer)double[N];

    for (int i = ; i < N; i++)

    {

        p3[i] = p4[i] = i + 10.8 ;

        std::cout << "p3===   " << &p3[i] << "  " << p3[i];

        std::cout << "   p4===   " << &p4[i] << "  " << p4[i] << std::endl;

    }

    double *p5, *p6;

    std::cout << "\n\n\n";

    p5 = new double[N];

    p6 = new (buffer)double[N];

    for (int i = ; i < N; i++)

    {

        p6[i] = p5[i] = i + 10.8;

        std::cout << "p5===   " << &p5[i] << "  " << p5[i];

        std::cout << "   p6===   " << &p6[i] << "  " << p6[i] << std::endl;

    }

    std::cin.get();

}

p2 p4 p6 的地址保持一样！！！