ow to output with 3 digits after the decimal point with C++

//How to output with 3 digits after the decimal point with C++ stream?

#include <iostream>
using namespace std;

int main () {
    double f = 113.;
    cout.setf(ios::fixed,ios::floatfield);
    cout.precision(3);
    cout << f << endl;
    return 0;
}