how to set decimal precision in c++ for all output code example

Example 1: setprecision in c++

#include<iomanip>
#include <iostream>
using namespace std;

int main()
{
   int num = 45;
  cout << "it is: " << fixed << setprecision(2) << num << " the end"<< endl;
  
  return 0;
}

Example 2: set precision with fixed c++

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