change float precision c++ code example

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

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

Example 2: 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;
}