🚀 go-pugleaf

The errors you got do just pretain to C++.  They pertain to any language
that uses a linker (I think).  The problem is that you made references to
functions you didn't define.  You _declared_ them in your header file, 
but you didn't link in a module where they are defined.

You another file something like this:

String.cc:

#include "String.h"

String::set_to( char *s) {

    strcpy( text, s);
}

String::length() {

    return strlen( text);
}

String::read() {

    return text;
}

String::print() {

    cout << text;
}

You need to compile this file and link it with your program.  An
easy way to do this is:

g++ my_prog.c String.c -o my_prog

Hope this helps.

MikeB