/in/foo.cc: In function 'int main()':
/in/foo.cc:16:17: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
   16 |  while (scanf("%d", n)) {
      |                ~^   ~
      |                 |   |
      |                 |   int
      |                 int*
/in/foo.cc:16:14: warning: 'n' is used uninitialized in this function [-Wuninitialized]
   16 |  while (scanf("%d", n)) {
      |         ~~~~~^~~~~~~~~