Difference between revisions of "Programming performance/JasonWoof gforth"

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Programming language: gforth (should work in other forths too)
 
 
Experience level with language: quite a bit. I only had to look up a few things
 
 
Time spent: 102 minutes
 
 
Notes:
 
 
1) I implemented this problem once before in ruby (Don't think that helped too much though. The two languages have little in common.)
 
 
2) I wrote this from scratch, including a number parser and array/list code. In the real world one would hopefully already have code for these things.
 
 
3) This program expects gspc.txt to come through on stdin, so run like so: gforth jasonwoof_gspc.fs < gspc.txt
 
 
<pre>
 
 
#! /usr/bin/gforth
 
 
warnings off
 
 
fvariable bank 10000e bank f!
 
: p>f s>d d>f 100e f/ ; ( pennies -- float )
 
 
\ make a FOR that makes sense, and can take 0 as count, and UNLOOP
 
: for 0 postpone literal postpone ?do ; immediate
 
: next postpone loop ; immediate
 
 
: ++ 1 swap +! ; ( var -- )
 
: -- -1 swap +! ; ( var -- )
 
 
\ kill the header
 
: dump-line key 10 = if exit then recurse ;
 
dump-line
 
 
: dump-word key 32 = if exit then recurse ;
 
: dump-others 6 for dump-word next ;
 
 
variable #fields
 
variable last-field
 
 
: field-pop last-field @ 4 - dup last-field ! @ ; ( -- field ) \ return the next field
 
 
 
: -parse-close key dup 10 = if drop exit then dup [char] . = if drop recurse exit then 48 - swap 10 * + recurse ;
 
: parse-close 0 -parse-close ; ( -- pennies ) \ parse digits until end of line (ignoring decimal point)
 
: parse-field dump-others parse-close , #fields ++ ; ( -- )
 
: parse-fields begin key -1 = if exit then parse-field again ;
 
parse-fields
 
here last-field !
 
 
fvariable last-close
 
fvariable close
 
fvariable sell-thresh
 
 
\ initialize close
 
field-pop p>f close f!
 
#fields @ 1 - #fields !
 
 
variable #holds
 
create holds 1000 floats allot
 
: hold-close-a 2 * floats holds + ;
 
: hold-last-a #holds @ hold-close-a ;
 
: hold-last-close! hold-last-a f! ;
 
: hold-last-shares! hold-last-a float+ f! ;
 
: hold-close@ hold-close-a f@ ;
 
: hold-shares@ hold-close-a float+ f@ ;
 
: hold-push hold-last-shares! close f@ hold-last-close! #holds ++ ; ( #shares -- )
 
: hold-cleanup #holds @ dup for 1 - dup hold-close@ f0= 0= if unloop drop exit then #holds -- next drop ;
 
 
: get-close close f@ last-close f! field-pop p>f close f! ; ( -- )
 
: change close f@ last-close f@ f- last-close f@ f/ ; ( -- % )
 
: withdraw bank f@ 10e f/ bank f@ fover f- bank f! ; ( -- cash )
 
: deposit bank f@ f+ bank f! ; ( money -- )
 
: buy withdraw close f@ f/ hold-push ;
 
: ?buy change -0.03e f< if buy then ;
 
: hold-sell dup float+ f@ close f@ f* deposit >r 0e r> f! ; ( addr -- )
 
: -?hold-sell dup f@ sell-thresh f@ f> if drop exit then hold-sell ; ( addr -- )
 
: ?hold-sell dup f@ f0= if drop exit then -?hold-sell ; ( addr -- )
 
: set-sell-thresh close f@ 1.06e f/ sell-thresh f! ;
 
: -sell #holds @ for i hold-close-a ?hold-sell next ;
 
: sell set-sell-thresh -sell hold-cleanup ;
 
: trade #fields @ for get-close ?buy sell next ;
 
: sell-all 100000e sell-thresh f! -sell ;
 
 
trade
 
sell-all
 
 
bank f@ f. cr bye
 
 
</pre>
 

Revision as of 11:52, 6 February 2021