Подсчитать количество обоев для оклейки комнаты

#include "stdafx.h"
#include <iostream>
#include <iomanip>
 
using namespace std;
 
double length_of_first_wall = 6;
double length_of_second_wall = 7.5;
double high_of_walls = 3.2;
double width_of_door = 0.8;
double high_of_door = 2;
 
double square_of_walls, square_of_door, square_of_wallpaper;
double width_of_wallpaper, length_of_wallpaper;
double number_of_walpaper, effectitive_square;
 
int main() {
    setlocale(LC_ALL, "rus");
 
cout<<"Введите ширину рулона (в метрах) "<<endl;
cin>>width_of_wallpaper;
cout<<"Введите длину рулона (в метрах) "<<endl;
cin>>length_of_wallpaper;
 
square_of_wallpaper=width_of_wallpaper*length_of_wallpaper;//площадь рулона 
 
square_of_walls=2*(length_of_first_wall*high_of_walls) + 2*(length_of_second_wall*high_of_walls); //площадь стен
 
square_of_door=width_of_door*high_of_door;
 
effectitive_square=square_of_walls-square_of_door;
 
number_of_walpaper = effectitive_square/square_of_wallpaper;
 
cout<<"Количество рулонов  : "<<number_of_walpaper<<endl ;
 
system ("pause");
return 0;
}