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A = 1
StateCity1 = one
StateCity2 = two
StateCity3 = three

var := StateCity%A% ; Expression (:=)
Msgbox % var

; or
A++ ; A = 2
var = % StateCity%A% ; Traditional (=)
Msgbox % var

var := "StateCity" A + 1
var := %var%
Msgbox % var

; etc

;if you make a WinGet, WinID, List array...

MsgBox % WinID%A%  ;this works great

WinGet, program, ProcessName, ahk_id % WinID%A%  ;but this is a syntax error ("the following variable name contains an illegal character: WinID")

; example: using a dynamic variable which holds a window's unique ID
WinGet, program, ProcessName, % "ahk_id " . WinID%A_Index%
; notice the literal string "ahk_id " has a space on the left.
; this expression resolves to ahk_id 0x12345678

; example: using dynamic variables in a gui command
Gui, Add, Button, % "x" ( GuiWidth // 2 - ButtonWidth // 2 ) " y" ( GuiHeight // 2 - ButtonHeight // 2 ) " w" ButtonWidth " h" ButtonHeight " gSomeLabel", Button Text
; This would add a button smack-dab in the middle of the gui, provided the gui was actually
; as wide and tall as the variables imply

; example: using dynamic variables in the click command. 'Click' is a bit strange in that it only has 1 parameter
Click, % (A_ScreenWidth // 2) " " (A_ScreenHeight // 2) " Left 2"
; double-clicks the middle of the screen, assuming 'coordmode, mouse ,screen' is in effect

WinGet, program, ProcessName, % "ahk_id" WinID%A%

WinGet, program, ProcessName, % "ahk_id " WinID%A%

F1::
InputBox,times,How many?

x = 0
Loop, %times%
{
SetTitleMatchMode, 2
WinActivate, Excel
Send, ^c
Sleep, 200
%Sim%x% := clipboard
Sleep, 200
Send, {RIGHT}
Sleep, 200
Send, ^c
Sleep, 200
%Imei%x% := clipboard
Sleep, 200
Send, {DOWN}{LEFT}
Sleep, 200
x++
}
x = 0
Loop, %times%
{
   MsgBox, %Sim% x% - %Imei% x%
   x++
}
Return

F1::
x = 0
InputBox,times,How many?
Loop, %times%
{
SetTitleMatchMode, 2
WinActivate, Excel
Send, ^c
Sleep, 200
Sim%x% := clipboard
Sleep, 200
Send, {RIGHT}
Sleep, 200
Send, ^c
Sleep, 200
Imei%x% := clipboard
Sleep, 200
Send, {DOWN}{LEFT}
Sleep, 200
x++
}
x = 0
Loop, %times%
{
   MsgBox, % Sim%x% - Imei%x% ; you must force expression mode to perform a math operation
   x++
}
Return

x=0
Loop, 19 {
   Sim%x% := 19
   Imei%x% := 38
   x++
}
x=0
Loop, 19 {
   msgbox, Sim%x% - Imei%x%
   ;//     ^--- % missing = msgbox = Sim0 - Imei0
   msgbox, % Sim%x% - Imei%x%
   ;//     ^--- % present = msgbox = -19
   x++
}