p297 例9.10 引用静态数据成员.cpp

谭浩强 《C++ 程序设计》第三版的部分课后练习题源码

#include<iostream>
using namespace std;
class Box
{
      private:
             
              float width;
              float height;
      public:
             static float length;
             Box(float b,float c):width(b),height(c){}
             //void set_value();
             void cubage();
            
};

float Box::length=10;

void Box::cubage()
{
      float cube;
      cube=length*width*height;
      cout<<"the cubage of the cube is "<<cube<<endl;
     
     
}

int main()
{  Box a(12,34),b(34,67);
   cout<<a.length<<endl;
   cout<<b.length<<endl;
   cout<<Box::length<<endl;
   a.cubage();
   b.cubage();
   system("pause");
   return 0;
}