Обособяване на класове
Чете се информация за компютри, съдържаща:

OmniBook XE
5660
76
ACMA P300
1095
75
AMAX Poewrstation
1999
78

Търси се продукта с най-голямо отношение оценка/цена.

#include <iostream>
#include <string>
using namespace std;

int main()
{  string best_name = "";
   double best_price = 0;
   int best_score = 0;

   bool more = true;
   while (more)
   {  string next_name;
      double next_price;
      int next_score;

      cout << "Please enter the model name: ";
      getline(cin, next_name);
      cout << "Please enter the price: ";
      cin >> next_price;
      cout << "Please enter the score: ";
      cin >> next_score;
      string remainder; /* read remainder of line */
      getline(cin, remainder);

      if (next_price != 0)
      {  if (best_price == 0 or
            next_score/next_price > best_score/best_price)
         {  best_name = next_name;
            best_score = next_score;
            best_price = next_price;
         }
      }
      cout << "More data? (y/n) ";
      string answer;
      getline(cin, answer);
      if (answer != "y") more = false;
   }
   cout << "The best bang for the buck is " << best_name
      << " (Score: " << best_score
      << " Price: " << best_price << ")\n";
   return 0;
}

Интерфейс и капсулиране
#include <iostream>
#include <string>
using namespace std;

class Product  {
public:   /*интерфейс*/
   Product();                    /*създава нов продукт*/
   void read();                         /*чете продукт*/
   bool is_better_than(Product b) const;    /*сравнява*/
   void print() const;                     /*отпечатва*/
private:  /*капсулиране*/
   string name;                         /*скрити данни*/
   double price;                        /*скрити данни*/
   int score;                           /*скрити данни*/
};

int main()
{  Product best;

   bool more = true;
   while (more)
   {  Product next;
      next.read();
      if (next.is_better_than(best)) best = next;

      cout << "More data? (y/n) ";
      string answer;
      getline(cin, answer);
      if (answer != "y") more = false;
   }
   cout << "The best bang for the buck is ";
   best.print();
   return 0;
}