Calculator

I tried to make a calculator but i ran into some errors that i can't figure out myself :/

I get this error: bios:338: [string "Calc"]:13: 'then' expected

The code goes like this:
local x
print ("Please enter a value: ")
x = read()

local z
print ("Please enter a math method: ")
z = read()

local y
print ("Please enter what to "..z.." with "..x..": ")

if z = + then
print (the answer is: "..x+y)
elseif z = - then
prin.. and so on.

Got any help for me? :3

You need quotes around the + to indicate that it's a string, like this:

if z = "+" then

Oh ok, thanks! :D/>

It didn't work :/

This line:

print (the answer is: "..x+y)

should go like

print ("the answer is: ".. (x+y))

No one here can tell you what is wrong when the info you give is "it didn't work". Anyway, here are some of your errors:

You see that you need to do the same for this line, right?

elseif z = - then

becomes

elseif z = "-" then

Also, you're taking the sum of string and nil (x+y), that's impossible. Your line (note the missing "):

print (the answer is: "..x+y)

Easy way for now is to directly convert the input to numbers, like this:

local x
print ("Please enter a value: ")
x = tonumber( read() )

And above that, y never gets a value assigned!