/*20.If a method cannot be inline, if you do not want it to be
inline or if you want the class definition contain the minimum of
information, then you must just put the prototype of the method
inside the class and define the method below the class: */


#include <iostream>
using namespace std;

class vector
{
public:

   double x;
   double y;

   double surface();         // The ; and no {} shows it is a prototype
};

double vector::surface()
{
   double s = 0;

   for (double i = 0; i < x; i++)
   {
      s = s + y;
   }

   return s;
}

int main ()
{
   vector k;

   k.x = 4;
   k.y = 5;

   cout << "Surface: " << k.surface() << endl;

   return 0;
}