中国DOS联盟

我是初学者，请帮我看看下面的批处理哪里错了？
IF "%1"=="61" goto 61 ELSE goto no61
:no61
net use \\192.168.0.%1\ipc$ ""/user:"administrator" 554877
goto join
:61
net use \\192.168.0.%1\ipc$ ""/user:"kanthy" 452134
goto join
:join
IF "%2"=="" goto whojoin ELSE net use \\192.168.0.%1\%2$
IF "%3"=="" goto whojoin ELSE net use \\192.168.0.%1\%3$
IF "%4"=="" goto whojoin ELSE net use \\192.168.0.%1\%4$
:whojoin
net use \\192.168.0.%1\ipc$ ""/user:"administrator" xc123
net use z: \\192.168.0.%1\d$
copy log.txt z:\whojoin.log
net use z: /del /y
date /t >>\\192.168.0.%1\d$\whojoin.log

IF指令是沒有ELSE可用的

IF "%1"=="61" goto 61
:no61
net use \\192.168.0.%1\ipc$ ""/user:"administrator" 554877
goto join
:61
net use \\192.168.0.%1\ipc$ ""/user:"kanthy" 452134
goto join
:join
IF NOT "%2"=="" net use \\192.168.0.%1\%2$
IF NOT "%3"=="" net use \\192.168.0.%1\%3$
IF NOT "%4"=="" net use \\192.168.0.%1\%4$
:whojoin
net use \\192.168.0.%1\ipc$ ""/user:"administrator" xc123
net use z: \\192.168.0.%1\d$
copy log.txt z:\whojoin.log
net use z: /del /y
date /t >>\\192.168.0.%1\d$\whojoin.log

cmd中的IF命令確實有ELSE可用，不過在這種情況下應加上括號。

用C++写dos命令可以吗？