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

class CWin
{
private:
    char id;
    int width, height;

public:
    int area()
    {
        return width*height;
    }
    void show_area()
    {
        cout << "window " << id << ", area= " << area() << endl;
    }

    void set_data(const char &i, const int &w, const int &h)
    {
        id = i;
        width = w;
        height = h;
    }

    void set_data(const char &i)
    {
        id = i;
    }

    void set_data(const int &w, const int &h)
    {
        width = w;
        height = h;
    }
};

int main(void)
{
    CWin winA, winB;

    winA.set_data ('A',50,40);
    winB.set_data ('B');
    winB.set_data (80,120);

    winA.show_area();
    winB.show_area();

    system("pause");
    return 0;
}