Variable doesn't get updated in the function of Batch file -

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i have simple batch script read value in file version.property , perform job code below 

title starteodmaintenance echo off cls set "build=0"  call:findstring "mainalgo" if /i "%build%" == "mainalgo" ( echo "start job on mainalgo" ) else (     call:findstring "drsitealgo"     echo build value %build%     if /i "%build%" == "drsitealgo" (         echo "start job on secondalgo"     ) else (     echo "sth wrong"         ) )  :findstring echo funtioninput %~1 find /i /c "%~1" version.property if %errorlevel%==1 ( echo "errorlevel 1" set "build=0" ) if %errorlevel%==0 ( echo "errorlevel 0"  set "build=%~1" echo build value in function %build% ) :end

the content in version.property below 

drsitealgo

the problem found when program executed looks below line work incorrectly. variable build not set value in "%~1"

set "build=%~1"

i got below output 

funtioninput mainalgo  ---------- version.property: 0 "errorlevel 1" funtioninput drsitealgo   ---> %~1 show correct value, drsitealgo     ---------- version.property: 1     "errorlevel 0" build value in function 0   ---> here wrong! build variable somehow didn't updated, suppose drsitealgo    build value 0 "sth wrong"

not sure have set make works??

the %variables% expanded when command parsed , command if followed block parsed at once. when set variable in block, following usage (in echo here) has been expanded , results in showing value valid before entering block!

you need delayed expansion read variable values @ moment when used, not parsed. first, issue command:

setlocal enabledelayedexpansion

then refer variables modified earlier within same block !variable!.

if %errorlevel%==0 ( echo "errorlevel 0"  set "build=%~1" echo build value in function !build! )

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