windows Win bat 文件：如何在 for 循环中为变量添加前导零？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9430642/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Win bat file: How to add leading zeros to a variable in a for loop?
提问by Cambiata
Very simple, I guess... I need to get a usable variable by adding leading zeros to the loop index variable (%%i) below.
很简单，我猜...我需要通过向下面的循环索引变量 (%%i) 添加前导零来获得一个可用的变量。
@echo off
for /L %%i in (1, 1, 5) do (
echo %%i
rem How to create a variable j here as a
rem result of adding leading zeros to %%i? (001, 002, 003 etc.)
)
pause
How? I've tried the following, but I can't get the value out of the %%i variable inte the var_ at a...
如何？我已经尝试了以下方法，但我无法从 %%i 变量中获取值，在 var_ 中...
@echo off & setlocal enableextensions
for /L %%i in (1, 1, 5) do (
echo %%i
set var_=00000%%i
set var_=%var_:~-5%
echo %var_%
)
pause
回答by jeb
Prefix the string with zeros and then take the desired count of characters from the right side:
用零前缀字符串，然后从右侧获取所需的字符数：
@echo off
set count=5
setlocal EnableDelayedExpansion
for /L %%i in (1, 1, %count%) do (
set "formattedValue=000000%%i"
echo !formattedValue:~-3!
)
Outputs:
输出：
001
002
003
004
005
回答by vaisakh
Using the setlocal enabledelayedexpansion, the solution is this:
使用setlocal enabledelayedexpansion，解决方案是这样的：
@echo off
setlocal ENABLEDELAYEDEXPANSION
set count=5
for /L %%i in (1, 1, %count%) do (
echo %%i
set j=00%%i
rem to display intermediate values inside loop, surround with !
echo !j!
)
endlocal
Here is a good reference: http://blog.crankybit.com/why-that-batch-for-loop-isnt-working/
这是一个很好的参考：http: //blog.crankybit.com/why-that-batch-for-loop-isnt-working/
