foo.cc: In function ‘int main()’:
foo.cc:16:5: warning: ‘zhen’ may be used uninitialized [-Wmaybe-uninitialized]
   16 | int zhen;
      |     ^~~~
foo.cc:44:16: warning: ‘dot’ may be used uninitialized [-Wmaybe-uninitialized]
   44 | for(int i=max;i>dot;i--)
      |               ~^~~~
foo.cc:14:5: note: ‘dot’ was declared here
   14 | int dot;
      |     ^~~