Variables and arithmetic (simple question)

[Antoni]

So I'm learning Lua and when I do this:

n = 20 
s = 390 
= n + s 

I get the error:

input:3: unexpected symbol near '=' 

I think my tutorial is giving me an example like this from 5.1 so how would I write this in 5.2?

[AHMAD1234]

you must put value before "="

[Antoni]

20 = n 
390 = s 
= n + s 

input:1: unexpected symbol near '20' 

I don't think it's that. I'm running off http://www.lua.org/cgi-bin/demo could that be the problem? Do I need some kind of plugins first?

[AHMAD1234]

I mean like this:-

n = 20 
s = 390 
w = n + s 

[DiSaMe]

print(n + s) 

[ixjf]

You can print with = on the Lua interpreter (not on the online Lua demo).

[IIYAMA]

Print is visible in the server console, but yes better to use output's.

[Antoni]

It was simply because I was using the live demo. Thanks, it's working on the downloaded version.