/in/foo.cc: In function 'int main()':
/in/foo.cc:41:25: warning: format '%c' expects argument of type 'char*', but argument 2 has type 'int*' [-Wformat=]
   41 |                 scanf("%c",&n);
      |                        ~^  ~~
      |                         |  |
      |                         |  int*
      |                         char*
      |                        %d