Batch Script : The mystery of setting variable inside for loop

 Spend whole day to figure out how to get a random terms inside for loop.

Tried %%list[!index!]%% , %list[!index!]% , !list[%index%]! many many combination. 

Finally, a "call" made the magic.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

@echo off setlocal enabledelayedexpansion REM Define the list set "list[0]=a" set "list[1]=b" set "list[2]=c" REM Enable delayed expansion within the loop for /l %%i in (1,1,3) do ( REM Generate a random index within the range of the list set /a "index=!random! %% 3" REM without that call, cannot get the string call set "randomString=%%list[!index!]%%" REM Print the iteration number and the corresponding random string echo Random string for iteration %%i: !randomString! ) endlocal