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add example: FloatVar.forth from Kiyoshi

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crc 2019-02-13 19:30:14 +00:00
parent 79e5cdabae
commit 21f417a635
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2
RELEASE_NOTES.md
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@ -106,6 +106,7 @@ June 2019.
- add CaptureOutput.forth
- add DisplayNames.forth
- add EvaluateString.forth
- add FloatVar.forth
- add Forget.forth
- add HTML.forth
- add KeyValueStore.forth
@ -120,6 +121,7 @@ June 2019.
- add share.forth and shared.forth
- add uuencode.forth
- add uudecode.forth
- fix test block in defstruct.forth
- switch to dvorak key bindings in Roo.forth
- remove Hooks.forth (now in core language)
- improved edit.forth from Kiyoshi

68
example/FloatVar.forth Normal file
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@ -0,0 +1,68 @@
Words to encode floating point numbers into two cells.
~~~
:st (-) dump-stack nl f:dump-stack ;
:f:sign (-n|f:a-)
f:dup .0 f:eq? [ #0 f:drop ] if;
.0 f:gt? [ #1 ] [ #-1 ] choose ;
~~~
~~~
:f:encode.w (|f:n-n) f:dup f:sign f:abs f:sqrt n:to-float f:* ;
:f:decode.w (|f:n-n) f:dup f:sign f:square n:to-float f:* ;
~~~
```
.-12345.6789 f:encode.w st
f:decode.w st
```
~~~
{{
:f:-shift9 .1.e9 f:* ;
:f:shift9 .1.e-9 f:* ;
---reveal---
:f:split (-|f:n-fi)_absFrac.-shift9_signedInt
f:dup f:sign (s|f:_n
f:abs f:dup f:floor f:swap f:over (s|f:_abs.int_abs_abs.int
f:- f:-shift9 (s|f:_abs.int_abs.frac.-shift9
f:swap n:to-float f:* (_|f:_abs.frac.-shift9_signedInt
;
:f:join (-|f:fi-n)
f:dup f:sign f:abs (s|f:_abs.frac.-shift9_abs.int
f:swap f:shift9 f:+ n:to-float f:* (_|f:_n
;
}}
~~~
```
.-123456789.0987654321 f:split st
f:join st
```
~~~
:f:to-w (-fi|f:n-)_frac_sInt
f:encode.w f:split f:to-number f:to-number swap ;
:w:to-f (fi-|f:-n)
swap n:to-float n:to-float (_|f:_abs.frac_signedInt
f:join f:decode.w ;
~~~
```
.-123456789.0987654321 f:to-w st
w:to-f st
```
~~~
:f:var (s-|f:n-) f:to-w rot d:create , , ; immediate
:f:fetch (a-|f:-n) fetch-next [ fetch ] dip w:to-f ;
:f:store (a-|f:n-) f:to-w rot store-next store ;
~~~
```
.-123456789.0987654321 'FVar f:var
&FVar f:fetch st
.-9876543210.123456789 &FVar f:store
&FVar f:fetch st
```