foo.cc: In function ‘int main()’:
foo.cc:17:13: warning: ‘zhen’ may be used uninitialized [-Wmaybe-uninitialized]
   17 |         int zhen;
      |             ^~~~
foo.cc:45:24: warning: ‘dot’ may be used uninitialized [-Wmaybe-uninitialized]
   45 |         for(int i=max;i>dot;i--)
      |                       ~^~~~
foo.cc:15:13: note: ‘dot’ was declared here
   15 |         int dot;
      |             ^~~