#include <iostream>
class Box
{
public:
// 构造函数
Box(int h = 2, int w = 2, int len = 2);
// 析构函数
~Box();
int volume();
protected:
int height, width, length;
};
Box::Box(int h, int w, int len)
{
height = h;
width = w;
length = len;
}
Box::~Box()
{
s...
C++类的继承
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