/in/foo.c: In function 'main':
/in/foo.c:15:2: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d\n",x);
  ^~~~~~~~~~~~~~~~
/in/foo.c: In function 'FindMax':
/in/foo.c:38:9: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return x;
         ^