China DOS Union

I just started learning batch files, and there are many things I don't understand how to implement. Could you experts help me improve the batch file below so it can meet the following requirements? Thank you!

I want to add batch statements at ::a and ::b to check whether the month and date are within range. The number cannot be 0, or greater than 12, or greater than 31. Letters and spaces must not be allowed as input either. If the input is wrong, return to start.
If there is a better way to handle this, I also hope the experts can suggest it. Thank you!

@echo off

:start

set /p input=请输入月份:

::a

set /p date=请输入日期:

::b

echo 

pause

goto start



end

[ Last edited by HAT on 2009-2-9 at 02:13 ]

Use findstr together with it?

Thanks, teacher. I tried it, and it can do what's needed, but if the value is empty and Enter is pressed, it still won't catch it, and it will continue executing. Following your method, I made the following changes:
i@echo off
:start
set input=
set /p input=Please enter month [1-12]:
if "%input%"=="" goto start
echo %input%|findstr /v "[0-9]"&&(echo error&goto :start)
if %input% leq 0 (echo error&goto :start)
if %input% gtr 12 (echo error&goto :start)
:start_
set dt=
set /p dt=Please enter date [1-31]:
if "%dt%"=="" goto :start_
echo %dt%|findstr /v "[0-9]"&&(echo error&goto :start_)
if %dt% lss 1 (echo error&goto :start_)
if %dt% geq 32 (echo error&goto :start_)
echo Month:%input% Day:%dt%
goto :start