DOS batch: SET variable and ECHO it within (…) block

Question

I had a problem with set not working in a batch file; it took a while to distil the problem; at first I thought it was to do with subroutine calls...

The sc

Answer 1

User delayed expansion and ! instead of %

@echo off
setlocal enableextensions enabledelayedexpansion
set a=aaa
echo a = "%a%"
(
set b=bbb
echo b = "!b!"
)