/in/foo.c: In function 'zuixiaogongbeishu':
/in/foo.c:77:6: warning: variable 'x' set but not used [-Wunused-but-set-variable]
  int x,y;
      ^
/in/foo.c: In function 'main':
/in/foo.c:33:2: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d %d\n",x/z,y/z);
  ^~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:33:2: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]