player.cpp

#include <iostream>
 
using namespace std;
 
// Base class
class Player {
   public:
      // pure virtual function providing interface framework.
      virtual int getMove() = 0;
};
 
// Derived classes
class Human: public Player {
   public:
      int getMove() { 
          // TODO: add logic
         return 1;
      }
};

class Computer: public Player {
   public:
      int getMove() { 
          // TODO: add logic
         return 0;
      }
};

int battle(Player &p1, Player &p2) {
    return p1.getMove() + p2.getMove();
}
 
int main(void) {
   Human p1;
   Computer p2;
 
   cout << "value: " << battle(p1, p2) << endl;

   return 0;
}