测试虚函数输出怎么有多余字符
代码奉上：

C/C++ code

#include <iostream>#include <fstream>using namespace std;class Point{public:    Point(float aVal):m_X(aVal)    {        ++m_PointCount;    }    virtual ~Point()    {        --m_PointCount;    }    float GetData() const    {         return m_X;    }    static int GetPointCount()    {        return m_PointCount;    }    virtual ostream& Print(ostream & aStream) const     {        aStream << "m_X: " << m_X << endl            << "m_PointCount: " << m_PointCount << endl;        return aStream;    }protected:      float m_X;    static int m_PointCount;}; int Point::m_PointCount = 0;class Point2D : public Point{public:    Point2D(float aXVal, float aYVal):Point(aXVal),m_Y(aYVal)    {    }    virtual ~Point2D()    {    }    virtual ostream& Print(ostream& aStream)const    {        Point::Print(aStream);        aStream << "m_Y: " << m_Y << endl;        return aStream;    }protected:    float m_Y;};int main(){    Point *lP1 = new Point2D(0.5,0.6);    cout << lP1->Print(cout);    delete lP1;}

难道我看错了，还是代码写的有问题？

[解决办法]
cout << lP1->Print(cout);
改为 lP1->Print(cout);

你写得那句输出了 输入输出流缓冲的地址。