setprecision c++ code example

Example 1: ‘setprecision’ was not declared in this scope

//You have to include header file
#include <iomanip>

Example 2: set precision with fixed c++

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

Example 3: setprecision c++

// setprecision example
#include <iostream>     // std::cout, std::fixed
#include <iomanip>      // std::setprecision

int main () {
  double f =3.14159;
  std::cout << std::setprecision(5) << f << '\n';
  std::cout << std::setprecision(9) << f << '\n';
  std::cout << std::fixed;
  std::cout << std::setprecision(5) << f << '\n';
  std::cout << std::setprecision(9) << f << '\n';
  return 0;
}