/in/foo.c: In function 'FindMax':
/in/foo.c:12:9: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return max;
         ^~~
/in/foo.c: In function 'main':
/in/foo.c:22:2: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d", max);
  ^~~~~~~~~~~~~~~~~