header file in c++ example

Example 1: what is a header in c++

// my_class.cpp
#include "my_class.h" // header in local directory
#include <iostream> // header in standard library

using namespace N;
using namespace std;

void my_class::do_something()
{
    cout << "Doing something!" << endl;
}

Example 2: how to include seld declared header file in c++

#include "Employee.h"
//Employee.h should be saved in the same directory.