Reversing a string in batch

[Helpmeh]

As the title suggests, I want to reverse a string/variable in batch. Eg. the input is hello and the output is olleh. I know it is possible in vbs, but if possible, the script needs to be put in batch.

[devcom]

Code: [Select]

@echo off
setlocal enabledelayedexpansion

set line=sdas sfsa fwfwa21321
set num=0

:LOOP
call set tmpa=%%line:~%num%,1%%%
set /a num+=1
if not "%tmpa%" equ "" (
set rline=%tmpa%%rline%
goto LOOP
)
echo %rline%

pause

[Helpmeh]

Thanks so much!

[gh0std0g74]

anything can be put inside  a put batch, including the cscript /wscript engine. Its better next to time state you want "pure cmd.exe commands without use of external tools".

[billrich]

As always Devcom's  effort is over and above.  Does Devcom work for Microsoft?

C:\>type  hi.bat
@echo off

Code: [Select]

setlocal enabledelayedexpansion

set line=%1
echo  line = %line%
set num=0

:LOOP
call set tmpa=%%line:~%num%,1%%%
set /a num+=1
if not "%tmpa%" equ "" (
set rline=%tmpa%%rline%
goto LOOP
)
echo reverse = %rline%
Output:

C:\> hi.bat  Hello
 line = Hello
reverse = olleH
C:\>

_______________________________________ _

For a laugh I will show a newbie effort with batch:


C:\>type  hello.bat

Code: [Select]

@echo off

REM  http://www.dostips.com/DtTipsStringManipulation.php

setlocal enabledelayedexpansion

set x=%1
echo x = %x%

set x=%x:~-2,-1%
echo  %x% > rev.txt
set x=%1
set x=%x:~-3,-2%
echo  %x% >> rev.txt
set x=%1
set x=%x:~-4,-3%
echo  %x% >> rev.txt
set x=%1
set x=%x:~-5,-4%
echo  %x% >> rev.txt
set x=%1
set x=%x:~-6,-5%
echo  %x% >> rev.txt
type rev.txt
C:\>hello.bat  "Hello"
x = "Hello"
 o
 l
 l
 e
 H

C:\>

[devcom]

As always Devcom's  effort is over and above.  Does Devcom work for Microsoft?

lol , im not

[gh0std0g74]

here's a one liner, using gawk

Code: [Select]

C:\test>echo hello| gawk "BEGIN{FS=\"\"}{for(i=NF;i>0;i--)printf $i}"
olleh