Windows批处理文件处理-循环 [英] Windows Batch file processing - Loops

问题描述

对于批处理划时代来说是非常新的.我只是试图执行下面的代码，对此我完全感到困惑.

Am very new to batch scritping. I just tried to execute the below code for which am totally confused.

@echo off
set m=100
set i=0
FOR /L %%N IN (0,1,%m%)do (
set /a i=1+%i%
)

回声％i％ 暂停

在这里，正在递增i的值，直到N达到100.因此，我期望循环结束时i的值为101，但它显示1.有人可以解释这背后的原因吗.

Here, am incrementing i value until N reaches 100. So, am expecting the value of i at the end of loop to be 101 but it shows 1. Can anyone explain what's the reason behind this.

谢谢

推荐答案

您需要延迟扩展: http://www.robvanderwoude.com/variableexpansion.php

@echo off
setlocal enableDelayedExpansion
 set m=100
 set i=0
 FOR /L %%N IN (;;0,1,%m%;;) do (
   set /a i=1+!i!
 )
endlocal & set /a i=%i%
echo %i%

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