01.cpp

通过重载运算符new和delete可以克服new和delete的不足

#include<iostream.h>
#include<malloc.h>

class Rect
{
	int length,width;
public:
	Rect (int l,int w)
	{
		length=l,width=w;
	}
	void disp()
	{
		cout <<"面积"<<length*width <<endl;
	}
	void *operator new (size_t size)
	{
		return malloc(size);
	}
	void operator delete (void *p)
	{
		free (p);
	}
};

void main()
{
	Rect *p;
	int l,w;
	cout<<"Enter the length:";
	cin>>l;
	cout<<"enter the width:";
	cin>>w;
	p=new Rect (l,w);
	p->disp();
	delete p;
}