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 #include <iostream>
using namespace std;
 
class Plansza
{
    public:
    char tablica[25][70];
 
    void rysuj() const
    {
        for(int i = 0; i < 25;i++)
        {
            for(int j = 0; j < 70;j++)
            {
                tablica[i][j] = 0;
            }
        }
 
        int i = 0,j = 0;
        for(int j = 0; j < 70; j++)
        {
             tablica[i][j] = (char) 219;
        }
 
        for(int i = 1 ;i < 25; i++)
        {
            tablica[i][0] = (char) 219;
            tablica[i][69] = (char) 219;
        }
 
        for(j = 0; j < 70; j++)
        {
            i = 24;
            tablica[i][j] = (char) 219;
        }
        for(int i = 0;i < 25;i++)
        {
            for(int j = 0; j < 70;j++)
            {
               cout << tablica[i][j] ;
            }
            cout << endl;
        }
    }
};
 
int main()
{
    Plansza mapa;
    mapa.rysuj();
    return 0;
}

prog.cpp: In member function 'void Plansza::rysuj() const':
prog.cpp:15:31: error: assignment of read-only location '((const Plansza*)this)->Plansza::tablica[i][j]'
                 tablica[i][j] = 0;
                               ^
prog.cpp:22:28: error: assignment of read-only location '((const Plansza*)this)->Plansza::tablica[i][j]'
              tablica[i][j] = (char) 219;
                            ^
prog.cpp:27:27: error: assignment of read-only location '((const Plansza*)this)->Plansza::tablica[i][0]'
             tablica[i][0] = (char) 219;
                           ^
prog.cpp:28:28: error: assignment of read-only location '((const Plansza*)this)->Plansza::tablica[i][69]'
             tablica[i][69] = (char) 219;
                            ^
prog.cpp:34:27: error: assignment of read-only location '((const Plansza*)this)->Plansza::tablica[i][j]'
             tablica[i][j] = (char) 219;
                           ^

Standard output is empty