How to calculate the length of a string using batch processing
This article is about how to use batch processing to calculate the length of strings. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.
The code is as follows:
@echo off & setlocal EnableDelayedExpansion
:: Calculate the length of a string
::
::
:began
set mystr=
set /p mystr= Enter the string to calculate the length (enter directly to exit):
if not defined mystr goto :eof
for /l %%i in (0,1,1000) do if "! mystr:~%%i,1! "=="" set strlen=%%i && goto :_endfor
:_endfor
::echo String: "%mystr%"
echo Length: %strlen%
set strlen=
goto began
The flaw of this scheme is that it will not be detected when the string length exceeds 1000; however, it seems that the length that the variable can accept cannot exceed 1000.
Another option:
@echo off
:: Based on willsort's codes code by JM 2006-10-9 CMD@XP
:: Source: www.cn-dos.net/forum/viewthread.php? tid=19819
set mystr=
set /p mystr= Enter the string to calculate the length (enter directly to exit):
if not defined mystr goto :eof
set count=0
setlocal enabledelayedexpansion
:intercept
set /a count+=1
for /f %%i in ("%count%") do if not "! mystr:~%%i,1! "=="" goto intercept
echo Length: %count%
pause
goto :eof
@echo off
::
::
:began
set /p mystr= Enter string to calculate length:
echo %mystr:~0,1% |findstr /i "q" 1>nul 2>nul && exit rem Enter q to exit
call :bflen "%mystr%" rem These two sentences call bflen and return the length to the variable ret.
echo string: "%mystr%"
echo Length: %ret%
goto began
:bflen rem is really troublesome, initialization has to be taken out separately.
set num=
set str=
set ret=
set str=%1
:len rem Calculates string length
set str=%str:~0,-1%
set /a num = %num% + 1
if defined str goto len
set /a ret = %num% - 2
set num=
goto :eof
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