How to pickup null value in variable

[phillid]

Hello. I have a program where the user 'inputs' text. The user could type nothing, which gives the error:

Code: Select all

'(' was unexpected at this time

I understand why it does this, but I don't know how to make an IF statement pickup this null value and tell the user to type something.

Thanks

phillid

[aGerman]

Have a look at this

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@echo off &setlocal

:: destoy the %input% in case you set any value before
set "input="

:: Wait for user input
set /p "input=Enter your value: "

:: variable input is "not defined" in case the user entered nothing
if not defined input (
  echo you entered nothing
)

:: if you would use quotes, you get no error
if "%input%"=="xyz" (
  echo you entered xyz
) else (
  echo you entered NOT xyz
)

pause

Regards
aGerman

[miskox]

aGerman always supplies complete answers. Maybe in one line you need this:

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if "%input%"=="" echo Empty string entered.

Hope this helps.

Saso

[aGerman]

Yes, that is also a possibility.
Indeed the result of if "%input%"=="" ... is the same like my suggestion if not defined input ...

Regards
aGerman