How add a a number to a variable in batch

Question

Hey I'm working on a project of mine in batch. yes I know its bad but I'm using it anyways. I was trying to make an updating inventory system when I ran into this problem. I was trying to add a set number E.X 1 to a variable like this:

@echo off
set var=0
echo I will add these numbers from var+1
set /a var=%var%+1
pause
echo var
pause

what is the problem?

Answer 1

To show the value of the variable var, you need

echo %var%