C++ class redefinition error - Help me understand headers and linking

Question

I started writing a simple interpreter in C++ with a class structure that I will describe below, but I quit and rewrote the thing in Java because headers were giving me a ha

Answer 1

Most header files should be wrapped in an include guard:

#ifndef MY_UNIQUE_INCLUDE_NAME_H
#define MY_UNIQUE_INCLUDE_NAME_H

// All content here.

#endif

This way, the compiler will only see the header's contents once per translation unit.