/in/foo.cc:11:1: warning: multi-line comment [-Wcomment]
   11 | //                                                     | \__ \
      | ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:118:29: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'int' [-Wformat=]
  118 |         double_bird_chirp("%s", a + b);
      |                            ~^   ~~~~~
      |                             |     |
      |                             char* int
      |                            %d