Question about implementing abstract functions in C++? -

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i learning , testing piece of c++ code follows:

#include "stdafx.h" #include <iostream> using namespace std; #include <conio.h> #include <cstring> class shape { public:     shape() {};     ~shape() {};     virtual void display() const = 0;     virtual double volume() const = 0; };  class square : public shape { public:     square() {};     ~square() {};     void display() const;     double volume() const; };  void square::display() const {     cout << "square!!!!!!!!!!!!!!" << endl; } double square::volume() const {     cout << "square volume........." << endl;     return 0.0; }  int _tmain(int argc, _tchar* argv[]) {     shape *s;     s = new square; // error here     (*s).display();      return 0; }

the above code not compile successfully. produces: "fatal error lnk1120: 1 unresolved externals". can me out that? using ms vs c++ 2005. thanks

the above code compiles , runs on vs 2010 ideone.

check this

there nothing wrong in way have implemented abstract functions in above snippet.


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