You can learn how to make Forth interpreter if you want to, it is very simple to make.

I can explain the steps:

1. Read a word from input stream (ending with any type of white-spaces)
2. Look it up in dictionary
3. If is in dictionary, do execute/compile word according to what type it is
4. If it isn't in dictionary, try to treat it as a number
5. Do it again for the next word

You can define the primitives, they don't have to be very much. Most things are defined directly in Forth. See my signature for a example of defining IF and THEN command in Forth.

I made in QBASIC: http://zzo38computer.cjb.net/prog/QBFORTH/QBFORTH.ZIP

This post has been edited by zzo38 on Aug 21 2008, 09:05 PM