how to define an endl in c++ code example

Example 1: C++ and endl

// endl example
#include <iostream>     // std::cout, std::end
using namespace std;
int main () {

  int a=100;
  double b=3.14;

  cout << a;
  cout << endl;              // manipulator inserted alone
  cout << b << endl << a*b;  // manipulator in concatenated insertion
  endl (cout);               // endl called as a regular function

  return 0;
}

Example 2: c++ endl

cout << "Hello " << '\n'<<"world";
cout << "Hello " << endl<<"world";
//Hello  
//world