precision and fixed in c++ code example

Example 1: set precision with fixed c++

int x = 109887;
cout << fixed << setprecision(3) << x;

Example 2: precision of fixed in c++

#include <iomanip> 
// the rest of the code
double a = 4.032;
cout << fixed << setprecision(2);
cout << a;
// done;