system("cls");

int clrscr( int & bok, int & x, int & y )
{
   
    COORD coordScreen = { x, y };
    DWORD cCharsWritten;
    DWORD dwConSize;
    HANDLE hCon = GetStdHandle( STD_OUTPUT_HANDLE );
    CONSOLE_SCREEN_BUFFER_INFO csbi;
   
    GetConsoleScreenBufferInfo( hCon, & csbi );
   
    dwConSize = csbi.srWindow.Right * csbi.srWindow.Bottom;
   
    FillConsoleOutputCharacter( hCon, TEXT( ' ' ), dwConSize, coordScreen, & cCharsWritten );
    GetConsoleScreenBufferInfo( hCon, & csbi );
   
   
    SetConsoleCursorPosition( hCon, coordScreen );
    return 0;
}