/in/foo.cc: In function 'int main()':
/in/foo.cc:17:18: warning: 'i' may be used uninitialized [-Wmaybe-uninitialized]
   17 |                 i=i+1;
      |                 ~^~~~
/in/foo.cc:5:21: note: 'i' was declared here
    5 |         int n,a,b,c,i;
      |                     ^