taofan712

@echo off
:loop
cls
set folder=
set /p folder=拖入要处理的文件夹
set "folder=%folder:"=%"
cd /d "%folder%"
cd ..
for /f "delims=" %%a in ("%folder%") do (
set folderpath=%%~dpa
set foldername=%%~na
)
set /a 1%foldername:~0,3%1 2>nul && goto threenum
set /a 1%foldername:~0,2%1 2>nul && goto twonum
echo;无需更改 &pause>nul & goto loop

:threenum
if exist %foldername:~3%.dll (
copy /y %foldername:~3%.dll "%folder%\"  
echo;处理完毕 & pause>nul & goto loop
) else ( 
echo;%foldername:~3%.dll不存在 & pause>nul & goto loop
)
:twonum
set /a 1%foldername:~0,2%1 2>nul && if exist %foldername:~2%.dll (
copy /y %foldername:~2%.dll "%folder%\"
echo;处理完毕 & pause>nul & goto loop
) else (
echo;%foldername:~2%.dll不存在 & pause>nul & goto loop &goto end
)
复制代码

当做作业练习，请好心人指点怎么写会更好。

taofan712

回复 6# 回家路上


    这不可能！你是怎么做到的？
   set name=123abc
   set /a num=name-0
怎么会得到“123”呢 ？什么原理啊，第二行的name不用%括起来是什么道理？请求指点。