foo.cc: In function 'int main()':
foo.cc:28:22: warning: 'zhen' may be used uninitialized [-Wmaybe-uninitialized]
   28 |         for(int i=0;i<=zhen;i++)
      |                     ~^~~~~~
foo.cc:20:13: note: 'zhen' was declared here
   20 |         int zhen;
      |             ^~~~
foo.cc:18:13: warning: 'dot' may be used uninitialized [-Wmaybe-uninitialized]
   18 |         int dot;
      |             ^~~

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