CODEWITHSUNDEEP
arraysbatch-file
Wolf
Wolf

Reputation: 125

Batch file Array creation/modification

so i am trying to make an array using batch, i know, primitive, but i'm learning code from the ground up, so batch is something i'd love very much to learn before i jump to something else, anyways, i know i can create an array using this syntax:

@echo off set a[0] = 1 set a[1] = 2 set a[2] = 3 set a[3] = my input variable here

My question is, how can i add a new line to the array or modify an existing one using user input ?

I mean that i'd like to use a user input variable as a new line or modify an existing line on the array !

Upvotes: 1

Views: 1479

Answers (3)

Wolf
Wolf

Reputation: 125

so i found what i needed on a DOS forum, it was pretty simple:

< myfile.txt ( set /p line1= set /p line2= set /p line3= set /p line4= set /p line5= ) set line

i still want to modify some things, like adding automatic line count increment, so every time a new string is added to the text file, it will automatically create a new (set /p line"n"=) so right now it works for what i want, it reads each line on the specified text file, and places it on a variable on the list, once is there, i can use the variable for whatever i need, not exactly an array, but close enough, only thing, if you do not implement "automatic line increment" you have to manually create the empty variable, as i did on the code example above, you can see i wrote up to "5 variables" so if you enter a 6th, it will still add it to the text file, but the script won't list it, therefore, the need to automatically increment the empty variables.

Upvotes: 1

Hackoo
Hackoo

Reputation: 18827

This an example to show you how to create and populate an array using set /p command and how to modify the value of an element into the array !

@echo off
setlocal enabledelayedexpansion
Set "StartIndex=0"
Set "EndIndex=3"
Rem To populate the array
for /L %%i in (%StartIndex%,1,%EndIndex%) do (
    echo Write something 
    set /p "Array[%%i]="
)
echo Enter any key to show the values of the elements in the array
pause>nul
Rem To show the values of the elements in the array
For /L %%i in (%StartIndex%,1,%EndIndex%) do (
    echo Array[%%i] = !Array[%%i]!
)
echo Write anything to add and store it as new element 4 in the array
pause>nul 

Set /P "Array[4]="
echo Array[4] = !Array[4]!
echo Write anything to add and store it as new element 5 in the array 
pause>nul

Set /P "Array[5]="
echo Array[5] = !Array[5]! 
echo Hit any key to show the new array with values added
pause>nul

for /L %%i in (0,1,5) do (
    echo Array[%%i] = !Array[%%i]!
)

Rem Modification of an element
echo Write something here to replace Array[3] = !Array[3]!
pause>nul

set /p "Array[3]="
echo The new element is updated as Array[3] = !Array[3]!

echo Hit any key to show the modification
pause>nul
for /L %%i in (0,1,5) do (
    echo Array[%%i] = !Array[%%i]!
)
pause

Edit on 01/08/2016 @ 14:25 :

How to read data line by line from a text file and populate them into an array ?

@echo off
Set "File=%~n0.txt"
echo write your name :
set /p "A[0]="
echo %A[0]% > %File%
cls
echo write your Birtheday :
set /p "A[1]="
echo %A[1]% >> %File%
cls
echo write your gender :
set /p "A[2]="
echo %A[2]% >> %File%
cls
echo Read data line by line from a text file and populate it to an array
echo(
REM Read data line by line from a text file and populate it to an array
setlocal enabledelayedexpansion
set /a i=-1
Rem populate the data readed from the text file into an array
for /f "delims=" %%f in ('Type "%File%"') do (
 set /a i=!i!+1
 set  "A[!i!]"="%%f"
)
set /a lastindex=!i!
for /L %%f in (0,1,!lastindex!) do ( 
  echo "A[%%f]=!A[%%f]!"
)
pause
cls
echo The content of A[0] is : "!A[0]!"
echo The content of A[1] is : "!A[1]!"
echo The content of A[2] is : "!A[2]!" 
pause
cls
set /a "Beforelastindex=!lastindex! - 1"
echo Before last element is : "!A[%Beforelastindex%]!"
echo The last elemnt value is is "!A[%lastindex%]!"
pause
cls
Rem for example edit and modify your birthday and save it in the file text
echo edit and modify your birthday
set /p "A[1]="
(
    for /L %%i in (0,1,%lastindex%) do (
        echo !A[%%i]! 
    )   
)>"%File%"
Start "" "%File%" & exit

Upvotes: 2

user6017774
user6017774

Reputation: 

set /p A[0]=Enter line to replace A[0]

Is how.

Here's a link showing how to build VB.NET programs without additional tools than what comes with windows.

How to find the window Title of Active(foreground) window using Window Script Host

Upvotes: 0

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