/in/foo.cc: In function 'int main()':
/in/foo.cc:25:24: error: expected ')' before 'sum'
  printf("%d,%.2f", sum sum / 16.0f);
                        ^~~
/in/foo.cc:25:35: warning: format '%f' expects a matching 'double' argument [-Wformat=]
  printf("%d,%.2f", sum sum / 16.0f);
                                   ^