/in/foo.cc: In function 'int main()':
/in/foo.cc:19:21: warning: 'z' may be used uninitialized [-Wmaybe-uninitialized]
   19 |                 b[i]=z;
      |                 ~~~~^~
/in/foo.cc:15:13: note: 'z' was declared here
   15 |         int z;
      |             ^