/in/foo.cc: In function 'int main()':
/in/foo.cc:14:20: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
   14 |         printf("%.2f\n",c);
      |                 ~~~^    ~
      |                    |    |
      |                    |    int
      |                    double
      |                 %.2d