/in/foo.cc: In function 'int main()':
/in/foo.cc:12:27: warning: precision used with '%n' gnu_printf format [-Wformat=]
   printf("%.nf",(float)a/b);
                           ^
/in/foo.cc:12:27: warning: format '%n' expects argument of type 'int*', but argument 2 has type 'double' [-Wformat=]