/in/foo.cc: In function 'int main()':
/in/foo.cc:40:9: warning: 'out' may be used uninitialized in this function [-Wmaybe-uninitialized]
   printf("%d\n",out);
   ~~~~~~^~~~~~~~~~~~
/in/foo.cc:35:7: note: 'out' was declared here
   int out;
       ^~~