Answers for "header file example c++"

what is a header in c++

// my_program.cpp
#include "my_class.h"

using namespace N;

int main()
{
    my_class mc;
    mc.do_something();
    return 0;
}

how does header files work in c++

"It works by copying your entire header file into the file specifying"
"a #include. It then compiles your code after this copy and pasting."

how to declare a function in c++ header file

//somefile.h
#ifndef SOMEFILE_H
#define SOMEFILE_H
int add(int a, int b);
#endif