Expand 2 variables at the same time

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ImAhNoBoDy
Posts: 7
Joined: 16 Nov 2016 12:03

Expand 2 variables at the same time

#1 Post by ImAhNoBoDy » 16 Nov 2016 16:18

I'm trying to expand 2 variables at the same time. Is this possible? The issue I'm having is during the IF statement. Instead of echoing 1 and then 2, the script echos 1 and 1.

Code: Select all

SETLOCAL ENABLEDELAYEDEXPANSION

SET i=0
SET ARR[%i%]=1
SET /A "i+=1"
SET ARR[%i%]=2
SET /A "i+=1"
SET ARR[%i%]=3
SET ARR

SET len=%i%
SET i=0

IF YO EQU YO (ECHO !ARR[%i%]!
SET /A "i+=1"
ECHO !ARR[%i%]!)


I did try variations of !ARR[!i!]!, ^!ARR[!i!]^!, !ARR[^!I^!]!, and ^!ARR[^!I^!]^! with undesirable results. Anyone can help? Thanks.

penpen
Expert
Posts: 1777
Joined: 23 Jun 2013 06:15
Location: Germany

Re: Expand 2 variables at the same time

#2 Post by penpen » 16 Nov 2016 18:51

If a compound statement (or block) is processed, then (normal/percentage) expansion is done before the internal commands are execute.
Example (assumed value of variable "i" os zero):

Code: Select all

(
   ECHO !ARR[%i%]!
   SET /A "i+=1"
   ECHO !ARR[%i%]!
)
Then the expansion is computed for this this block with this result:

Code: Select all

(
   ECHO !ARR[0]!
   SET /A "i+=1"
   ECHO !ARR[0]!
)
After that the statements are (delayed expanded and) executed one after another.

Avoid using "%i%" is a typical workaround in such a case:

Code: Select all

(
   ECHO !ARR[%i%]!
   SET /A "i+=1"
   for %%a in (!i!) do ECHO !ARR[%%~a]!
)


penpen

pieh-ejdsch
Posts: 217
Joined: 04 Mar 2014 11:14
Location: germany

Re: Expand 2 variables at the same time

#3 Post by pieh-ejdsch » 17 Nov 2016 12:04

In an Array you can use this

Code: Select all

@echo off
setlocal
:::!ARR[1]!,!ARR[2]!,!ARR[3]!,!ARR[4]!::ARR[!N!]::

for /f "tokens=1,2 delims=:" %%i in ('findstr /r "^:::" "%~f0"') do  (
  for /l %%a in (6 3 17) do (
    set /a N+=1
    rem echo %%j
    setlocal enabledelayedexpansion
    rem echo %%j
    for /f "delims=" %%b in ("%%j=%%a") do endlocal&set "%%~b"
  )
  rem echo %%i
  setlocal enabledelayedexpansion
  echo %%i
  endlocal
)


Phil

Yury
Posts: 115
Joined: 28 Dec 2013 07:54

Re: Expand 2 variables at the same time

#4 Post by Yury » 19 Nov 2016 09:10

Code: Select all

setlocal

SET i=0
SET ARR[%i%]=1
SET /A "i+=1"
SET ARR[%i%]=2
SET /A "i+=1"
SET ARR[%i%]=3
SET ARR

SET len=%i%
SET i=0

IF YO EQU YO (
 cmd/v/c ECHO !ARR[%i%]!
 SET /A "i+=1"
 cmd/v/c cmd/v/c ECHO !ARR[!i!]!
)

endlocal

ImAhNoBoDy
Posts: 7
Joined: 16 Nov 2016 12:03

Re: Expand 2 variables at the same time

#5 Post by ImAhNoBoDy » 06 Dec 2016 05:03

The solution was to replace ECHO !ARR[%i%]! with CALL ECHO %%ARR[!i!]%%

Aacini
Expert
Posts: 1623
Joined: 06 Dec 2011 22:15
Location: México City, México

Re: Expand 2 variables at the same time

#6 Post by Aacini » 06 Dec 2016 09:18

or with FOR %%i IN (!i!) DO ECHO !ARR[%%i]!, that run faster...

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