cpp header file code example

Example 1: what is a header in c++

// my_class.h
#ifndef MY_CLASS_H // include guard
#define MY_CLASS_H

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

#endif /* MY_CLASS_H */

Example 2: c++ include header

#include "headerfile.h"

Example 3: c++ header files

// You should use header files when you wan't to split your
// program across multiple files. Use it like this:

// vec2.hpp
class vec2 {
	public:
  		void printVec(); // Decleration
  		float x, y;
}
// vec2.cpp
#include "vec2.hpp"
void vec2::printVec() { // Implementation
	std::cout << x << y << std::endl;
}

Example 4: what is a header in c++

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

Example 5: c++ header files example

//headers 
#ifndef TOOLS_hpp 
#define TOOLS_hpp
#include<vector> 
#include<iostream>
#include<fstream>
#include<string>
using std::ifstream;
using std::cout; 
using std::cin;
using std::endl;
using std::cerr;
using std::vector;
using std::string;
// functions prototypes 
inline vector<int> merge(const vector<int>&a,const vector<int>& b);//merge function prototype with Formal Parameters 
std::vector<int> sort(size_t start, size_t length, const std::vector<int>& vec);//sort function prototype with formal parameters 
#endif

Example 6: including cpp header file in c++

#include "enter_name_here.cpp"

//Make sure the files are in the same directory.