View Compilation Error

0_0_39230682_2093.cpp: In function 'int main()':
0_0_39230682_2093.cpp:15:60: error: 'setprecision' was not declared in this scope
   15 |                 cout << "Case #" << cn << ": " << fixed << setprecision(3) << sum<< endl;
      |                                                            ^~~~~~~~~~~~
0_0_39230682_2093.cpp:3:1: note: 'std::setprecision' is defined in header '<iomanip>'; did you forget to '#include <iomanip>'?
    2 | #include<cmath>
  +++ |+#include <iomanip>
    3 | using namespace std;