batch file - How to change the value of a variable in a for loop -

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@echo off setlocal enabledelayedexpansion  if (%1)==(/?) (        echo hilfe zur verwendung des programms: echo.aufruf des programms mit 3 startwerten oder mit keinen startwert. echo.dabei muss jeder startwert eine zahl groesser als 0 sein! goto ende )    if (%1) == () (     echo.anfangskapital eingeben:     set /p anfangskapital= ) else (     set /a anfangskapital= %1  )  :checkanfangskapital     if %anfangskapital% leq 0 (     echo anfangskapital muss groesser 0 sein.     set /p anfangskapital=     goto checkanfangskapital )    if (%2) == () (     echo.zinssatz eingeben:     set /p zinssatz=  ) else (     set /a zinssatz = %2 )  :checkzinsatz     if %zinssatz% leq 0 (     echo zinsatz muss groesser 0 sein.     set /p zinssatz=     goto checkzinsatz )  if (%3) == () (     echo.anzahl jahre eingeben:     set /p jahre=  ) else (     set /a jahre = %3 )  :checkjahre     if %jahre% leq 0 (     echo anzahl jahre  muss groesser 0 sein.     set /p jahre=     goto checkjahre )  /l %%a in (1,1,%jahre%)   set /a anfangskapital = !anfangskapital! *(1+(%zinssatz%/100))     echo %anfangskapital%   :ende pause

the value of anfangskapital same, won't change value in for loop. don't know why. tried %% , !! doesn't change anything. how can change value of anfanskapital?

read on delayed expansion.

setlocal enabledelayedexpansion set /a endkap=%anfangskapital% /l %%a in (1,1,%jahre%) set /a endkap=!endkap! *(1+(%zinssatz%/100))  echo %endkap% rem 1000

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