syntax error in exercise about class

[ebucna]

I have to make a program where a disc is being moved on a 10 * 10 grid starting at position (1,1).

#include <iostream>

using namespace std;

class Grid{

private:
    short x = 1, y = 1, across, down;
public:
    void getCoordinates();
    void calcCoordinates(){x += across; y += down;};
    void outCoordinates(){cout << "Disc possition: (" << x << "," << y << ")\n\n";};
};

int main(){
    do{
        Grid disc;
        disc.getCoordinates();
        disc.calcCoordinates();
        disc.outCoordinates();
    }
    while(x != 10 && y != 10);
return 0;
}

void Grid::getCoordinates(){
    bool correct;
    do{
        bool correct = true;
        cout << "\n\tMove across: ";
        cin >> across;
        if ((x + across) < 0 || (x + across) > 10)
            correct = false;
    }
    while(!correct);
    do{
        bool correct = true;
        cout << "\n\tMove down: ";
        cin >> down;
        if((y + down) < 0 || (y + down) > 10)
            correct = false;
    }
    while(!correct);
}

how ever I get an error in line 22: 'x' and 'y' was not declared in this scope.
moving it to public doesn't change anything.
any idea why is that?

[MiiNiPaa]

Where did you declare x or y variable in your main function?

[ebucna]

in the class Grid, line 8

[MiiNiPaa]

in your main function?

You do not refer to variable in class, you refer to variable in current scope.

Consider

Grid disc;
Grid disc2;
//Which x? How can you refer unambiguously to correct one?
//x = 5 

[ebucna]

i get your point, i just had one class on Classes. how do i distinguish between the x i want and some other x?

[MiiNiPaa]

disc.x = 5;