how to link header files in c++

Question

I\'m new to programming in C++ with header files. This is my current code:

//a.h
#ifndef a_H
#define a_H
namespace hello
{
  class A
  {
    int a;
    public:
          


        

Answer 1

You need to compile and link both source files, e.g.:

g++ ex2.cpp a.cpp -o my_program