C++编程：继承

#include 

using namespace std;

class Shape
{
    public:
            void setlength(int len)
            {
                length = len;
            }

            void setweigth(int wei)
            {
                weigth = wei;
            }
    protected:
            int length;
            int weigth;
};
//
class Rec : public Shape
{
    public:
            int getarea()
            {
                return length * weigth;
            }
};

int main()
{
     Rec rec;
     rec.setlength(2);
     rec.setweigth(3);
     //put area
     cout<< "area = "< 
结果：
 
xl-VirtualBox:~/demo/c++/class$ ./jicheng 
area = 6