#include <stdio.h>class Point3d{public:    virtual ~Point3d(){}public:    static Point3d origin;    float x, y, z;};//从打印的地址看出这个类的结构应该是vptr|x|y|z,vptr是放类空间的头部的int main(){    printf("Point3d::x%p\n", &Point3d::x) ;//这个是求x在类中的偏移量    //printf("Point3d::y%p\n", &Point3d::y) ;    printf("Point3d::z--%p\n", &Point3d::z) ;    //printf("Point3d::origin%p\n", &Point3d::origin) ;    Point3d d;    printf("Point3d--%p\n", &d);//求具体的地址    printf("Point3d::z--%p\n", &d.z);//求具体的地址    getchar();    return 0;}