c++ include files code example

Example 1: c++ files

// basic file operations
#include <iostream>
#include <fstream>
using namespace std;

int main () {
  ofstream myfile;
  myfile.open ("example.txt");
  myfile << "Writing this to a file.\n";
  myfile.close();
  return 0;
}

Example 2: what is a header in c++

// my_class.h
namespace N
{
    class my_class
    {
    public:
        void do_something();
    };

}

Example 3: what is a header in c++

int x; // declaration
x = 42; // use x