/in/foo.cc: In function 'int main()':
/in/foo.cc:8:29: error: 'setprecision' was not declared in this scope
  std::cout << setprecision(2) << 1. / (1-p);
                             ^
/in/foo.cc:8:29: note: suggested alternative:
In file included from /in/foo.cc:3:0:
/usr/include/c++/6/iomanip:195:3: note:   'std::setprecision'
   setprecision(int __n)
   ^~~~~~~~~~~~