#513 Really odd problem with concatenation operator

[Paul Kislanko]

This one really perplexed me. I was trying to create a comma-separated-values file just by inserting ',' between field values in the record. With

do ws=maxws to 2 by -1; do ls=0 to ws-1; if scorecount.ws.ls = 0 then iterate; ofx += 1; oline.ofx = scorecount.ws.ls','ws','ls','ws-ls','ws+ls','(ws-ls)/(ws+ls)','; end; end;

I got:

'56' is not recognized as an internal or external command,
operable program or batch file'

I got the expected results when I changed it to:

do ws=maxws to 2 by -1; do ls=0 to ws-1; if scorecount.ws.ls = 0 then iterate; ofx += 1; oline.ofx = scorecount.ws.ls ',' ws ',' ls ',' ws-ls ',' ws+ls ',' (ws-ls)/(ws+ls) ','; end; end;

---

The 56 is what ws-ls evaluates to. But why would Regina interpret a string like ','ws-ls',' in the middle of an argument to the '=' assignment as a command?

[Gerard Schildberger]

 WAD.

 The literal    ','    immediate before a left parenthesis means 
 that REXX thinks that the   ,    (comma)  is an external
 function name, and it asks the host environment to execute the
 program    ','   with the argument of the value of   (ws-ls).  
 In this case, the argument is    56.

 Just change it to ',' || (ws-ls)/ ....

 In (under) the Microsoft Windows DOS enviornment, when you
 enter the command:

        ,     56

 --- that is to say:      (comma)  fifty-six

 my DOS window complains with:

 '56' is not recognized as an internal or external command,
 operable program or batch file.

 _________________________________________ Gerard Schildberger

[Paul Kislanko]

Yeah, this has bitten me before and I fix it like that. It's
counterintuitive, and the fix is ugly, but I guess there's no way to avoid
it. Why should ',' be considered a function name?

The prettier fix would be to calculate ws-ls outside of the statement, and
just have ','wsminusls',' which would not present the ',(' syntax to the
interpreter.

From: Gerard Schildberger [mailto:gerardschi@users.sf.net]
Sent: Monday, October 23, 2017 4:03 PM
To: [regina-rexx:bugs] 513@bugs.regina-rexx.p.re.sf.net
Subject: [regina-rexx:bugs] #513 Really odd problem with concatenation
operator

WAD.

The literal ',' immediate before a left parenthesis means
that REXX thinks that the , (comma) is an external
function name, and it asks the host environment to execute the
program ',' with the argument of the value of (ws-ls).
In this case, the argument is 56.

Just change it to ',' || (ws-ls)/ ....

In (under) the Microsoft Windows DOS enviornment, when you
enter the command:

    ,     56

--- that is to say: (comma) fifty-six

my DOS window complains with:

'56' is not recognized as an internal or external command,
operable program or batch file.

________ Gerard Schildberger
__

[bugs:#513] https://sourceforge.net/p/regina-rexx/bugs/513/ Really odd
problem with concatenation operator

Status: open
Group:
Created: Mon Oct 23, 2017 09:42 PM UTC by Paul Kislanko
Last Updated: Mon Oct 23, 2017 09:42 PM UTC
Owner: nobody

This one really perplexed me. I was trying to create a
comma-separated-values file just by inserting ',' between field values in
the record. With

do ws=maxws to 2 by -1; do ls=0 to ws-1; if scorecount.ws.ls = 0 then
iterate; ofx += 1; oline.ofx =
scorecount.ws.ls','ws','ls','ws-ls','ws+ls','(ws-ls)/(ws+ls)','; end; end;

I got:

'56' is not recognized as an internal or external command,
operable program or batch file'

I got the expected results when I changed it to:

do ws=maxws to 2 by -1; do ls=0 to ws-1; if scorecount.ws.ls = 0 then
iterate; ofx += 1; oline.ofx = scorecount.ws.ls ',' ws ',' ls ',' ws-ls ','
ws+ls ',' (ws-ls)/(ws+ls) ','; end; end;

---

The 56 is what ws-ls evaluates to. But why would Regina interpret a string
like ','ws-ls',' in the middle of an argument to the '=' assignment as a
command?

---

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