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REXX help

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tomwaites

tomwaites

Technical User
Nov 30, 2010
1
EU
REXX -

Can someone help please :)

I just need a simple code to output random numbers and letters, about 10 lines but they need to be unique!

i.e.
1234abcd56789efghij

Thanks in advance
 
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Here is an quick example, how to generate 10 lines of 20 random characters+digits.
To ensure, that the lines are unique, I marked every generated unique line in stem and by next line I proove if it's in stem or not.
random_lines.rex
Code: 
[COLOR=#0000ff]/************** main program *********************/[/color]
nr_lines [COLOR=#804040][b]=[/b][/color] 10   [COLOR=#0000ff]/* nr of lines to be generated   */[/color]
lines_used. [COLOR=#804040][b]=[/b][/color] 0 [COLOR=#0000ff]/* stem for storing lines  */[/color]

i [COLOR=#804040][b]=[/b][/color] 0
[COLOR=#804040][b]do [/b][/color][COLOR=#804040][b]while[/b][/color][COLOR=#804040][b] [/b][/color][COLOR=#008080]([/color]i [COLOR=#804040][b]<[/b][/color] nr_lines[COLOR=#008080])[/color]
  line [COLOR=#804040][b]=[/b][/color] [COLOR=#008080]random_line()[/color]
  [COLOR=#804040][b]if[/b][/color] lines_used.line [COLOR=#804040][b]=[/b][/color] 1 [COLOR=#804040][b]then[/b][/color] 
    [COLOR=#804040][b]nop[/b][/color] [COLOR=#0000ff]/* this line was generated before */[/color]
  [COLOR=#804040][b]else[/b][/color] [COLOR=#804040][b]do[/b][/color]
    lines_used.line [COLOR=#804040][b]=[/b][/color] 1 [COLOR=#0000ff]/* mark line in stem */[/color]
    lines_used.0 [COLOR=#804040][b]=[/b][/color] lines_used.0 [COLOR=#804040][b]+[/b][/color] 1
    i [COLOR=#804040][b]=[/b][/color] i [COLOR=#804040][b]+[/b][/color] 1
    [COLOR=#804040][b]say[/b][/color] [COLOR=#008080]right([/color] i[COLOR=#804040][b]||[/b][/color][COLOR=#ff00ff]'. '[/color][COLOR=#804040][b],[/b][/color] 4[COLOR=#008080])[/color] [COLOR=#804040][b]||[/b][/color] line [COLOR=#0000ff]/* print unique line */[/color]
  [COLOR=#804040][b]end[/b][/color] 
[COLOR=#804040][b]end[/b][/color]

[COLOR=#804040][b]exit[/b][/color] 

[COLOR=#0000ff]/******************* functions *******************/[/color]
[COLOR=#008080]random_line [/color][COLOR=#804040][b]:[/b][/color]
  [COLOR=#0000ff]/* creates random line of 20 characters+digits */[/color]
  line [COLOR=#804040][b]=[/b][/color] [COLOR=#ff00ff]""[/color]
  nr_char [COLOR=#804040][b]=[/b][/color] 0
  [COLOR=#804040][b]do [/b][/color][COLOR=#804040][b]while[/b][/color][COLOR=#804040][b] [/b][/color][COLOR=#008080]([/color]nr_char [COLOR=#804040][b]<[/b][/color] 20[COLOR=#008080])[/color]
    r [COLOR=#804040][b]=[/b][/color] [COLOR=#008080]random([/color]255[COLOR=#008080])[/color]
    [COLOR=#804040][b]select[/b][/color]
      [COLOR=#804040][b]when[/b][/color] [COLOR=#008080]([/color]r [COLOR=#804040][b]>=[/b][/color] 0 [COLOR=#804040][b]&[/b][/color] r [COLOR=#804040][b]<=[/b][/color] 9[COLOR=#008080])[/color] [COLOR=#804040][b]then[/b][/color] [COLOR=#804040][b]do[/b][/color]
        [COLOR=#0000ff]/* digit 0 to 9 */[/color]
        char [COLOR=#804040][b]=[/b][/color] r
        nr_char [COLOR=#804040][b]=[/b][/color] nr_char [COLOR=#804040][b]+[/b][/color] 1
        line [COLOR=#804040][b]=[/b][/color] line [COLOR=#804040][b]||[/b][/color] char
      [COLOR=#804040][b]end[/b][/color]
      [COLOR=#804040][b]when[/b][/color] [COLOR=#008080]([/color]r [COLOR=#804040][b]>=[/b][/color] 65 [COLOR=#804040][b]&[/b][/color] r [COLOR=#804040][b]<=[/b][/color] 90[COLOR=#008080])[/color] [COLOR=#804040][b]|[/b][/color] [COLOR=#008080]([/color]r [COLOR=#804040][b]>=[/b][/color] 97 [COLOR=#804040][b]&[/b][/color] r [COLOR=#804040][b]<=[/b][/color] 122[COLOR=#008080])[/color] [COLOR=#804040][b]then[/b][/color] [COLOR=#804040][b]do[/b][/color]
        [COLOR=#0000ff]/* character A..Za..z */[/color]
        char [COLOR=#804040][b]=[/b][/color] [COLOR=#008080]D2C([/color]r[COLOR=#008080])[/color]
        nr_char [COLOR=#804040][b]=[/b][/color] nr_char [COLOR=#804040][b]+[/b][/color] 1
        line [COLOR=#804040][b]=[/b][/color] line [COLOR=#804040][b]||[/b][/color] char
      [COLOR=#804040][b]end[/b][/color]
      [COLOR=#804040][b]otherwise[/b][/color]
        [COLOR=#804040][b]nop[/b][/color] 
    [COLOR=#804040][b]end[/b][/color] [COLOR=#0000ff]/* select */[/color] 
  [COLOR=#804040][b]end[/b][/color] [COLOR=#0000ff]/* while */[/color]
  [COLOR=#804040][b]return[/b][/color] line
Output
Code: 
 1. eRQZ7bJ1kdkE3GXo7rWz
 2. vf0YAc3ix2AagjEhrC7n
 3. ZaSplIT5fL2CHnVn3aHH
 4. cLIW3aS9pzNXe7Snv5Lp
 5. Nr2X4OxZNNs2Q9ezlFeo
 6. FKl06G1jVp0t6ZgMHSwe
 7. dPjd1tkLW0R2u2wqgdyw
 8. oLZFU5MjxvUIkjWS2Rgf
 9. ZbAIjD55QqPUUJORbTYo
10. AZu5oseMYj40nAIkcbgQ
 
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I simplified the function random_line() :
Code: 
[COLOR=#0000ff]/************** main program *********************/[/color]
nr_lines [COLOR=#804040][b]=[/b][/color] 10   [COLOR=#0000ff]/* nr of lines to be generated   */[/color]
lines_used. [COLOR=#804040][b]=[/b][/color] 0 [COLOR=#0000ff]/* stem for storing lines  */[/color]

i [COLOR=#804040][b]=[/b][/color] 0
[COLOR=#804040][b]do [/b][/color][COLOR=#804040][b]while[/b][/color][COLOR=#804040][b] [/b][/color][COLOR=#008080]([/color]i [COLOR=#804040][b]<[/b][/color] nr_lines[COLOR=#008080])[/color]
  line [COLOR=#804040][b]=[/b][/color] [COLOR=#008080]random_line()[/color]
  [COLOR=#804040][b]if[/b][/color] lines_used.line [COLOR=#804040][b]=[/b][/color] 1 [COLOR=#804040][b]then[/b][/color] 
    [COLOR=#804040][b]nop[/b][/color] [COLOR=#0000ff]/* this line was generated before */[/color]
  [COLOR=#804040][b]else[/b][/color] [COLOR=#804040][b]do[/b][/color]
    lines_used.line [COLOR=#804040][b]=[/b][/color] 1 [COLOR=#0000ff]/* mark line in stem */[/color]
    lines_used.0 [COLOR=#804040][b]=[/b][/color] lines_used.0 [COLOR=#804040][b]+[/b][/color] 1
    i [COLOR=#804040][b]=[/b][/color] i [COLOR=#804040][b]+[/b][/color] 1
    [COLOR=#804040][b]say[/b][/color] [COLOR=#008080]right([/color] i[COLOR=#804040][b]||[/b][/color][COLOR=#ff00ff]'. '[/color][COLOR=#804040][b],[/b][/color] 4[COLOR=#008080])[/color] [COLOR=#804040][b]||[/b][/color] line [COLOR=#0000ff]/* print unique line */[/color]
  [COLOR=#804040][b]end[/b][/color] 
[COLOR=#804040][b]end[/b][/color]

[COLOR=#804040][b]exit[/b][/color] 

[COLOR=#0000ff]/******************* functions *******************/[/color]
[COLOR=#008080]random_line [/color][COLOR=#804040][b]:[/b][/color]
[COLOR=#0000ff]/* creates random line of 20 characters+digits */[/color]
line [COLOR=#804040][b]=[/b][/color] [COLOR=#ff00ff]""[/color]
nr_char [COLOR=#804040][b]=[/b][/color] 0
[COLOR=#804040][b]do [/b][/color][COLOR=#804040][b]while[/b][/color][COLOR=#804040][b] [/b][/color][COLOR=#008080]([/color]nr_char [COLOR=#804040][b]<[/b][/color] 20[COLOR=#008080])[/color]
  r [COLOR=#804040][b]=[/b][/color] [COLOR=#008080]random([/color]255[COLOR=#008080])[/color]
  [COLOR=#804040][b]if[/b][/color] [COLOR=#008080]([/color]r [COLOR=#804040][b]>=[/b][/color] 48 [COLOR=#804040][b]&[/b][/color] r [COLOR=#804040][b]<=[/b][/color] 57[COLOR=#008080])[/color] [COLOR=#804040][b]|[/b][/color] [highlight #ffff00][COLOR=#000000],[/color][/highlight]
     [COLOR=#008080]([/color]r [COLOR=#804040][b]>=[/b][/color] 65 [COLOR=#804040][b]&[/b][/color] r [COLOR=#804040][b]<=[/b][/color] 90[COLOR=#008080])[/color] [COLOR=#804040][b]|[/b][/color] [highlight #ffff00][COLOR=#000000],[/color][/highlight]
     [COLOR=#008080]([/color]r [COLOR=#804040][b]>=[/b][/color] 97 [COLOR=#804040][b]&[/b][/color] r [COLOR=#804040][b]<=[/b][/color] 122[COLOR=#008080])[/color] [COLOR=#804040][b]then[/b][/color] [COLOR=#804040][b]do[/b][/color]
      [COLOR=#0000ff]/* character 0..9, A..Z, a..z */[/color]
      char [COLOR=#804040][b]=[/b][/color] [COLOR=#008080]D2C([/color]r[COLOR=#008080])[/color]
      nr_char [COLOR=#804040][b]=[/b][/color] nr_char [COLOR=#804040][b]+[/b][/color] 1
      line [COLOR=#804040][b]=[/b][/color] line [COLOR=#804040][b]||[/b][/color] char
  [COLOR=#804040][b]end[/b][/color]
[COLOR=#804040][b]end[/b][/color] [COLOR=#0000ff]/* while */[/color]
[COLOR=#804040][b]return[/b][/color] line
 
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Couldn't resist a post here, this might be faster, and also makes it easier to alter the alowable characters, so it's easy to remove the letter 'o' and number 0 if these characters are too similar, just remove them from the string. Or add specials if you want!

Phil
Code: 
/* REXX */
dgts='1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
maxlines=10 ; numchars=20
used.=0 ; lines=0
do while lines<maxlines
	code=''
	do numchars ; code=code||substr(dgts,random(length(dgts)-1)+1,1) ; end
	if used.code=0 then do
		used.code=1 ; lines=lines+1 ; say right(lines,length(maxlines),'0')||'. '||code
		end
end
exit 0

Output:
Code: 
01. 4YrSEX5Ft0HvS7XqdCAA
02. 74XQKNjZncSveH8r8U0j
03. XNxv3nKlaIHertk0gcc6
04. w1HzeSkIA3v1VsYM3JGN
05. kInJ689toGYb3r70Vw08
06. bu1eLPFm4PHNblPefIQp
07. d1VWMOaUSuYTNBheCdx2
08. 26wGXxxwsehRtFCfg9Jj
09. YmSZ3revpPfM8aAv81ed
10. rnVTGVlLPGR1KpeBgpZh

Press ENTER key to exit...
 
Upvote 0 Downvote
OK so it'll be quicker still if we remove the redundant calls to Length()

Phil

Code: 
/* REXX */
dgts='1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
maxlines=10 ; numchars=20
used.=0 ; lines=0 ; rmax=length(dgts)-1 ; ixlen=length(maxlines)
do while lines<maxlines
	code=''
	do numchars ; code=code||substr(dgts,random(rmax)+1,1) ; end
	if used.code=0 then do
		used.code=1 ; lines=lines+1 ; say right(lines,ixlen,'0')||'. '||code
		end
end
exit 0
 
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Just tested the speed of both progs;-

To generate 50,000 unique 20 digit codes (on my not-so-fast old pc)

My posted code took 72.163 seconds elapsed
Mikrom's posted code took 75.484 seconds elapsed

Just goes to show that however you write your code, Rexx does a good job!
But I did manage to shave a little off the run-time, just a little... ;-)

Phil
 
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