如何将一个变量从被调用的批处理文件返回给调用者？

Question

I want to be able to call a batch file like it were a function in Java or something of the like. Would it be possible to do something such as

set answer=call Calculate.bat %input1% %input2%

Where calculate.bat would calculate the sum of the two inputs, then it would assign it to the answer variable in the original batch file. Is this possible in some way?

Answer 1

If you use setlocal in your script like @SomethingDark said, you could to decide to transmit only certain variable

@ECHO OFF
setlocal

REM your code here, for example:
set /A "output=%1 + %2" > NUL

endlocal & set "answer=%output%"

REM variable %output% does not exist anymore
REM only %answer% remain changed (and stay the same once the script end)

Answer 2

like @Harry johnston said, if you set a variable in the batch file you called the variable will set in the caller to. if you do not want set any variables in the batch file you call, do:

for /f %%a in ('calculate.bat %input1% %input2%') do set "output=%%a"

the output of your command is stored in %output%