foo.cc: In function 'int main()':
foo.cc:17:26: warning: 'e' may be used uninitialized [-Wmaybe-uninitialized]
   17 |                         e=e+1;
      |                         ~^~~~
foo.cc:7:15: note: 'e' was declared here
    7 |         float e;
      |               ^

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