Bezemer J.L.'s 4tH, the friendly Forth compiler PDF

By Bezemer J.L.

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If you’re still wondering what you can do with Forth and 4tH in particular, let me tell you this: if you worked your way through this tour, you’ve been working with Forth all the time. The entire editor is a 4tH program, embedded in the 4tH executable, taking up less than 3 KB. ” program. Have fun! 9 The full calculator command set is listed in the ”Editor reference guide”. Part II Primer 60 Chapter 5 Introduction Don’t you hate it? You’ve just got a new programming language and you’re trying to write your first program.

What now appears is your program that is actually running: >r Enter number: 2005 Roman number: MMV After the program has ended, you will return to the menu. Well, that wasn’t too hard, was it? 4 Starting an editing session We start by entering the editor mode. Just type ”e” and hit enter. Ignore any file opening errors. The ”OK” prompt shows you you’re now in the editor. Now type: 0 clear This will erase the first screen and select it for editing. 4tH’s editor is a typical Forth editor. Forth organizes its mass storage into "screens" of 1024 characters.

Scr (O)bject file: out (E)dit (C)ompile (R)un (A)rguments (Q)uit (G)enerate (B)uild (D)ecompile > Now the second part of the program is run, that is the part after ’SLEEP’. Note that both the stack and the radix have remained intact. Every time ’SLEEP’ is invoked, it will return you to the prompt. When you enter ”r” again, it will continue where it left off, until it meets one of the following three conditions: 1. It encounters another ’SLEEP’; entering ”r” will continue where it left off. 2. It encounters ’ABORT’, ’QUIT’ or ’ABORT”’; entering ”r” will restart the program.

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4tH, the friendly Forth compiler by Bezemer J.L.

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