zaixinxiangnian

回复 252# 545810831


    看这好久，没有看明白，隔下能否解释下啊？

zaixinxiangnian

回复 253# kevinak


    set /a sum+=%%a
这是不是SUM+%%A。。。它怎么计算出所有值的和的呢？

zaixinxiangnian

弄了四五个小时 最后两题还是没有做出来
麻烦版主或哪位大侠给出好的参考代码
A1

@echo off
for /l %%i in (1,1,100) do echo %%i
pause>nul
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A2

@echo off
for /l %%i in (1,2,99) do echo %%i
pause>nul
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A3

@echo off
set val=bbs bathome.net
for %%i in (1 2 3) do echo %val%
pause>nul

A4-1

@echo off
for /f "tokens=1,2,3" %%i in (a.txt) do echo %%i %%j %%k
pause>nul
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A4-2

@echo off
for /f "tokens=2" %%i in (a.txt) do echo %%i
pause>nul
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B1

@echo off
for /f "skip=1" %%i in (1.txt) do echo %%i
pause>nul
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B2

@echo off
for /r c:\ %%i in (mplayer.*) do echo %%i
pause>nul
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B3

@echo off
for /l %%i in (100,-2,0) do set /a sum+=%%i
echo %sum%
pause
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B4

@echo off 
for /f "delims=“” tokens=5" %%i in (2.txt) do echo %%i
pause 
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B5

@echo off&setlocal enabledelayedexpansion
for /f "skip=15 delims=: tokens=2" %%i in ('ipconfig/all') do (
set /a n+=1
if !n!==1 set a=%%i
)
echo %a%
pause
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B6 跟B5应该差不多的，只是要加个USEBACKQ 可是怎么改都不对
我的文件本在D:\Program Files\2.txt  要提取的在第七行
下面是运行不成功

@echo off&setlocal enabledelayedexpansion
for /f "usebackq skip=6 tokens=*" %%i in ("D:\Program Files\2.txt") do (
set /a n+=1
if !n!==1 set a=%%i
)
echo %a%
pause
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其中把if !n!==1 set a=%%i 中的1 改为6 把skip去掉还是不行 请大侠指点

B7不会做