On 2/8/02 at 12:54 AM, Matt Schalit <[EMAIL PROTECTED]> wrote: > What does a hello world in FORTH look like?
: HELLO_WORLD ." Hello, World!" ; HELLO_WORLD > Maybe could you also post an example that asks > your full name then echos the first name and > last name on different lines? Text processing is not a basic part of FORTH - remember this is a low-level language like C (its main competition) or Assembly... It's been too long since I programmed Forth; here's an example that asks a name and echos it back. : GREET CR ." What's your name?" S0 @ 40 EXPECT 0 >IN ! 1 TEXT CR ." Hello, " PAD 40 -TRAILING TYPE ." , I speak FORTH." ; GREET > btw, for Java, the two examples are easier to make > as a gui app, but the answer for a terminal would be: > Those would be compiled with: > > javac *.java > > which creates Hello.class and Fullname.class. > Those are the executables, and they are run with: > > java Hello > java Fullname > > Java is very case sensative, and classes start > with a capital letter. FORTH was case-sensitive, but some modern versions are not. FORTH is an environment, not just a compiler - think of Smalltalk here. The Forth prompt is: ok (cute, eh?) Comments are ( this is a FORTH comment - cute, eh?) ....or.... \ This is a one line comment.... The examples above define a new "word" that extends the language (by using a : ....... ; construct) then execute it by name. FORTH is what is called a "Threaded Language" - FORTH is made up of pointers, or pointers to pointers. The "interpreter" is constantly resolving pointers. In Modern Times, we have Postscript, OpenBOOT, and the FreeBSD boot loader - all of which are FORTH or FORTH-like. The corporation that embodies Forth - at least in terms of longevity, and early language luminaries - is Forth, Inc, and they are still going strong. Forth, in fact, is strong in embedded systems - you can get a complete Forth interpreter, with editor, assembler, and quite a few other things in way less than 64k. I can remember a 192k Apple II multitasking under FORTH quite nicely.... -- David Douthitt UNIX Systems Administrator HP-UX, Unixware, Linux [EMAIL PROTECTED] _______________________________________________ Leaf-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-devel