#include<iostream>
using namespace std;
class CShape
{
public:
    CShape();
    void output(int x,int y);
    ~CShape();
};

CShape::CShape()
{
}

void CShape::output(int x,int y)
{
    printf("%d\n",x*y);
}

CShape::~CShape()
{
}



class CCircle:public CShape
{
public:
    CCircle();
    void coutput(int x,int y);
    ~CCircle();
};

CCircle::CCircle()
{
}

void CCircle::coutput(int x,int y)
{
    printf("%d\n",x+y);
}

CCircle::~CCircle()
{
}

int main()
{
    CCircle pCCircle;
    pCCircle.coutput(10,10);
    pCCircle.output(10,10);
    return 0;
}

编译可以通过，链接不行

拜托看下啊！