Question

I am getting a segmentation fault when I try to call a class function in my program. During my program, the matrix grid[][] changes rapidly, and I want to be able to at a certain time save an “image” of the grid, so that I can compare later versions of the grid to this reference. So when I try to save the “image” of grid[][] to the reference matrix, I simply copy all of the values to it using a for loop. I did a couple tests during my program and I seem to be getting a segmentation fault during the getreference function.

class lattice
{
public:
    lattice(){} // Constructor
    ~lattice(){} // Destructor
    void getgrid(){...}

    //Other functions...

    void getreference()
  {
    for(int a = 0; a<SIZEX; a++)
    {
        for(int b = 0; a<SIZEY; b++)
        {
            reference[a][b] = grid[a][b];
        }
    }
  }

private:
    short grid[SIZEX][SIZEY];
    short reference[SIZEX][SIZEY];
}

Answer 1

for(int b = 0; a < SIZEY; b++)

should be

for(int b = 0; b < SIZEY; b++)

That’s why you got a segmentation fault.