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: Creating an array
set a[0] = 1

:: Optional way to create array - Iterate through list of values
@echo off 
set list = 1 2 3 4 
(for %%a in (%list%) do ( 
   echo %%a 
))


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: ACCESSING ARRAY ELEMENTS
@echo off
set a[0] = 1 
set a[1] = 2 
set a[2] = 3 
echo The first element of the array is %a[0]% 
echo The second element of the array is %a[1]% 
echo The third element of the array is %a[2]%


:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: MODIFYING ARRAY

@echo off 
set a[0] = 1 
set a[1] = 2 
set a[2] = 3 
Rem Adding an element at the end of an array 
Set a[3] = 4 
echo The last element of the array is %a[3]%

::You can modify an existing element of an Array by 
::assigning a new value at a given index as shown in the following example −


@echo off 
set a[0] = 1 
set a[1] = 2 
set a[2] = 3 
Rem Setting the new value for the second element of the array 
Set a[1] = 5 
echo The new value of the second element of the array is %a[1]%



:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: ITERATING OVER ARRAY

:: CASE 1 - WE KNOW SIZE
Iterating Over an Array
Iterating over an array is achieved by using the ‘for’ loop and going through each element of the array. The following example shows a simple way that an array can be implemented.

@echo off 
setlocal enabledelayedexpansion 
set topic[0] = comments 
set topic[1] = variables 
set topic[2] = Arrays 
set topic[3] = Decision making 
set topic[4] = Time and date 
set topic[5] = Operators 

for /l %%n in (0,1,5) do ( 
   echo !topic[%%n]! 
)

:: CASE 2 - WE DONT
set sources[0]=C:\Users\P.Doulgeridis\Desktop\SAPRUN00FILE\AAyymmddm1.txt
set sources[1]=C:\Users\P.Doulgeridis\Desktop\SAPRUN00FILE\AAyymmddm1EPAN.txt
set sources[2]=C:\Users\P.Doulgeridis\Desktop\SAPRUN00FILE\AAyymmddm1PPC.txt
set sources[3]=C:\Users\P.Doulgeridis\Desktop\SAPRUN00FILE\ALyymmddm1.V51.txt
set sources[4]=C:\Users\P.Doulgeridis\Desktop\SAPRUN00FILE\ALyymmddm1.V52.txt

for /F "tokens=2 delims==" %%s in ('set sources[') do (
	IF NOT EXIST %%s (
		CALL:error10 "225" "UNABLE TO LOCATE TARGET FILE %%s "
		CALL:ERRORNOTIFYMAIL "UNABLE TO LOCATE TARGET FILE %%s" "FATAL" "CHECK EXISTENCE OF TARGET FILES"
		EXIT /B 11
	) ELSE (
	ECHO TARGET DIRECTORY %%s LOCATED SUCCESFULLY
	ECHO.
	)
	set /a "numberoffilesout+=1"
)

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: LENGTH OF ARRAY
::Length of an Array
::The length of an array is done by iterating over the list 
::of values in the array since there is no direct function 
::to determine the number of elements in an array.

@echo off 
set Arr[0] = 1 
set Arr[1] = 2 
set Arr[2] = 3 
set Arr[3] = 4 
set "x = 0" 
:SymLoop 

if defined Arr[%x%] ( 
   call echo %%Arr[%x%]%% 
   set /a "x+=1"
   GOTO :SymLoop 
)
echo "The length of the array is" %x%

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: CREATING STRUCTURES IN ARRAYS

Creating Structures in Arrays
Structures can also be implemented in batch files using a little bit of an extra coding for implementation. The following example shows how this can be achieved.

Example
@echo off 
set len = 3 
set obj[0].Name = Joe 
set obj[0].ID = 1 
set obj[1].Name = Mark 
set obj[1].ID = 2 
set obj[2].Name = Mohan 
set obj[2].ID = 3 
set i = 0 
:loop 

if %i% equ %len% goto :eof 
set cur.Name = 
set cur.ID =

for /f "usebackq delims ==. tokens = 1-3" %%j in (`set obj[%i%]`) do ( 
   set cur.%%k = %%l 
) 
echo Name = %cur.Name% 
echo Value = %cur.ID% 
set /a i = %i%+1 
goto loop

::The following key things need to be noted about the above code.
::Each variable defined using the set command has 2 values associated 
::with each index of the array.
::The variable i is set to 0 so that we can loop through 
::the structure will the length of the array which is 3.
::We always check for the condition on whether the value 
::of i is equal to the value of len and if not, we loop through the code.

::We are able to access each element of the structure using the obj[%i%] notation.