批处理 - 在变量中使用变量

Question

Hello , today I was playing with .bat code . I would like to change title with changing variable in itself. The way I would like to use title command is from variable %t% . I know where is the problem - The variable %t% after set /an=%n% + 1 is outdated and still have value n=0 . Is there any way to automatically update %t% without typing again set t=title changing %n% ? I Thought there will be some way to "lock" the variable %n% so it get the last possible value. (after typing itself in the %t% )

set /a n=0
set t=title changing %n%
%t%
pause
set /a n=%n% + 1
%t%
pause

sorry for not good EN, THX for any response <3

Answer 1

@echo off
setlocal EnableDelayedExpansion

set /a n=0
set "t=title changing ^!n^!"
%t%
pause
set /a n=%n% + 1
%t%
pause

For an explanation, look for "Delayed Expansion" in this site...

PS - You may enter set /an=%n% + 1 in this way: set /an=n + 1 or even in this simpler one: set /an += 1