/in/foo.cc: In function 'int main()':
/in/foo.cc:13:15: warning: 'c' may be used uninitialized [-Wmaybe-uninitialized]
   13 |         cout<<c;
      |               ^
/in/foo.cc:5:17: note: 'c' was declared here
    5 |         int a,b,c,n;
      |                 ^