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#include <iostream.h> 

class goods 

{ 

private: 

static int totalWeight; 

int weight; 

public: 

goods(int w) 

{ 

weight=w; 

totalWeight =w; 

} 

goods(const goods &gd)    //1.必须是引用,否则在调用拷贝函数的时候,又会去复制构造一个对象,就是调用本身了

//2.常引用和普通引用不好说,最好是常引用,保证原来的不被修改

{ 

weight=gd.weight; 

totalWeight =weight; 

} 

~goods() 

{ 

totalWeight-=weight; 

} 

static int getTotal() 

{ 

return totalWeight; 

} 

}; 

int goods::totalWeight=0; 

void main() 

{ 

int w; 

cout < <"the initial weight of goods:" < <goods::getTotal() < <endl; 

cin>>w; 

goods g1(w); 

cin>>w; 

goods g2(w); 

goods g3(g2); 

cout < <"the goods weight of goods:" < <goods::getTotal() < <endl; 

}