int dx=0, dy=0;

            while(dx+dy==0)
            {
              unsigned char random;

              // random = rand();
              fread(&random, 1, 1, stdin);

              random %= 4;

              if ((random==0)&&maze[r-1][c])dy = -1, dx = 0;
              else if ((random==1)&&maze[r][c+1]) dy = 0, dx = 1;
              else if ((random==2)&&maze[r+1][c]) dy = 1, dx = 0;
              else if ((random==3)&&maze[r][c-1]) dy = 0, dx = -1;
            }

            x+=dx;
            y+=dy;