C++使用对象指针

#ifndef BOX_H
#define BOX_H
struct Box{
double length;
double width;
double height;
double volume();
};
#endif

#include "box.h"
double Box::volume(){
return length*width*height;
}

#include <iostream>
using std::cout;
using std::endl;
#include "box.h"
int main(){
Box box={70.0,60.0,40.0};
Box* pBox=&box;
cout<<endl
<<"Volume is:"<<pBox->volume()<<endl;
Box* pdBox=new Box;
pdBox->height=pBox->height+5.0;
pdBox->length=pBox->length-2.0;
pdBox->width=pBox->width-2.0;
cout<<"Volume is:"<<pdBox->volume()<<endl;
delete pdBox;
return 0;
}