/in/foo.c: In function 'main':
/in/foo.c:21:30: warning: unused variable 'loc_y' [-Wunused-variable]
  int m, n, count = 0, loc_x, loc_y;
                              ^~~~~
/in/foo.c:21:23: warning: unused variable 'loc_x' [-Wunused-variable]
  int m, n, count = 0, loc_x, loc_y;
                       ^~~~~