foo.cc: In function 'int main()':
foo.cc:24:14: warning: 'zhen' may be used uninitialized [-Wmaybe-uninitialized]
   24 | for(int i=0;i<=zhen;i++)
      |             ~^~~~~~
foo.cc:16:5: note: 'zhen' was declared here
   16 | int zhen;
      |     ^~~~
foo.cc:14:5: warning: 'dot' may be used uninitialized [-Wmaybe-uninitialized]
   14 | int dot;
      |     ^~~

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