c9-10.cpp

这我们老师对是面向对象程序设计（清华大学出版社）一书制作的PPT

#include <iostream>
using namespace std;

class Box
 {public:
   Box(int,int);
   int volume();
   static int height;
   int width;
   int length;
 };

Box::Box(int w,int len)
 {
  width=w;
  length=len;
 }
int Box::volume()
 {return(height*width*length);
 }
int Box::height=10;

int main()
 {
  Box a(15,20),b(20,30);
  cout<<a.height<<endl;
  cout<<b.height<<endl;
  cout<<Box::height<<endl;
  cout<<a.volume()<<endl;
  return 0;
 }