I can't build a derive class object！who can help me!

#include<iostream>
class CShape
{

private:
    char cType[20];
    float fArea;

public:

    CShape(){}
    CShape(char * cType_name , float fA) : fArea(fA) { std::strcpy(cType,cType_name); }
    virtual void print()
    {

        std::cout << "Type: " << cType << std::endl;
        std::cout << "Area: " << fArea << std::endl;

    }
    virtual float area() const = 0;

};

class CCircle : public CShape
{

private:
    float fRadius;

public:

    CCircle(){}
    CCircle (float fR=0 ) : CShape("CCircle",3.14*fR*fR) { fRadius=fR;}
    virtual void print ()
    {

        CShape::print();
        std::cout << "Radius: " << fRadius << std::endl;

    }

    float virtual area() { return 3.14*fRadius*fRadius; }


};


int main()
{

    CCircle cir(1);

}