C++中对象指针的使用

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//定义结构

Box.h:

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

//定义volume方法
t1.cpp:

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

test.cpp:

#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;	
}