Download e-book for iPad: And so Forth by Bezemer J.L.

By Bezemer J.L.

Do not you hate it? you've gotten simply obtained a brand new programming language and you are attempting to write your first software. you need to use a undeniable characteristic (you understand it has got to be there) and also you cannot locate it within the manual.I've had that have time and again. So during this guide you can find many brief good points on all type of subject matters. the way to enter a bunch from the keyboard, what a mobile is, etc.I desire this can assist you to get fast in your method. If it did not, e-mail me at 'hansoft@bigfoot.com'. you won't simply get a solution, yet you are going to support destiny Forth clients as well.You can use this guide methods. you could both simply get what you would like or paintings your approach via. each part builds at the wisdom you acquired within the past sections. All sections are grouped into degrees. we propose you to exploit what you have realized after you have got labored your approach via a level.If this is not sufficient to coach you Forth you could continuously get a true solid textbook on Forth, like ''Starting Forth'' through Leo Brodie. have a good time!

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We can place ’SIGN’ wherever we want. 15" is it? Well, in order to do that there is another very handy word called ’HOLD’. The word ’HOLD’ just copies any character into the formatted number. 0002$ Then we want to print a dot. This is where ’HOLD’ comes in. ’HOLD’ takes an ASCII code and places the equivalent character in the formatting string. We don’t have to look up the ASCII code for a dot of course. We can use ’CHAR’: # # char . hold 0002$ CHAPTER 3. ARRAYS AND STRINGS 42 Then we want to print the rest of the number (which is at least one digit): # # char .

Which is usually correct, unless you’ve manipulated the Return Stack yourself. Note that there are other words beside ’I’, which do exactly the same thing: copy the top of the Return Stack. LOOP. We’ll see an example of that in the following section. 7 Other Return Stack manipulations The Return Stack can avoid some complex stack acrobatics. Stack acrobatics? Well, you know it by now. Sometimes all these values and addresses are just not in proper sequence, so you have to ’SWAP’ and ’ROT’ a lot until they are.

Finally, we execute "GREET" and it says "Hello". It seems as if "GREET" is simply an alias for "HELLO", but if it were it would print "Hello" throughout the program. However, the second time we execute "GREET", it prints "Goodbye". That is because we assigned the address of "GOODBYE" to "A". The trick behind this all is ’EXECUTE’. g. "HELLO" from the stack and calls it. In fact, the expression: hello Is equivalent to: ’ hello execute This can be extremely useful. We’ll give you a little hint: create subs ’ hello , ’ goodbye , Does this give you any ideas?

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And so Forth by Bezemer J.L.


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