How do I have one thing equal more than one things?

K, I'm making a computer login program that has multiple login usernames, but instead of using "if input == something or something then"
I'm trying to use "usernamecorrect = { kadecamz, Kadecamz }" and "if input == usernamecorrect".

But its not working, please tell me what I'm doing wrong.

You don't need two names of varying capitals if you use string.lower()

usernameCorrect = "kadecamz"
input = string.lower(read("*"))
if input == usernameCorrect then
--stuff to do
end

This way you could type in kadecamz, Kadecamz or kAdEcAmZ if you want, and it would still work.

I'm doing exactly such a program right atm.

local userFile
local passwordFile
local users = {}
local passwords = {}
local passwordEntered
local userEntered
local userNum = 0
local lineRead

function readUsersAndPasswords()
fs.makeDir("passwordFolder")
userFile = fs.open("passwordFolder/users","r")
passwordFile = fs.open("passwordFolder/passwords","r")


lineRead = userFile.readLine()
repeat
table.insert(users,lineRead)
lineRead = userFile.readLine()
until lineRead == nil

lineRead = passwordFile.readLine()
repeat
table.insert(passwords,lineRead)
lineRead = passwordFile.readLine()
until lineRead == nil
passwordFile.close()
userFile.close()
end

function password()
   textutils.slowPrint("Please enter your password "..users[userNum], 15)
   passwordEntered = read("*")
   if passwordEntered == passwords[userNum] then
	  term.clear()
	  term.setCursorPos(1,1)
	  textutils.slowPrint("Password match.", 15)
	  textutils.slowPrint("Welcome "..users[userNum], 15)
   elseif passwordEntered == "retry" then
	  username()
   else
	  term.clear()
	  term.setCursorPos(1,1)
	  textutils.slowPrint("Password missmatch. Please try again.", 15)
	  textutils.slowPrint("Type 'retry' to enter a new username.", 15)
	  password()
   end
end

function username()
   userNum = 0
   term.clear()
   term.setCursorPos(1,1)
   textutils.slowPrint("Welcome", 15)
   sleep(1)
   term.clear()
   term.setCursorPos(1,1)
   textutils.slowPrint("Please enter your username", 15)
   userEntered = read()
   for i=1, #users do
	  if userEntered == users[i] then
   	  userNum = i
		 break
	  end
   end
   if userNum == 0 then
	  textutils.slowPrint("Username could not be recognized. Please try again", 15)
	  username()
   else
	  term.clear()
	  term.setCursorPos(1,1)
	  textutils.slowPrint("Username recognized.", 15)
	  sleep(1)
	  term.clear()
	  term.setCursorPos(1,1)
	  password()
   end
end

readUsersAndPasswords()
username()

end
  

it saves usernames and passwords inside files.. I'm right now coding so that different users can do different stuff.

Well if you use this function

-- The function returns true if the element is a value inside of the table
function table.contains(table, element)
  for _, value in pairs(table) do
	if value == element then
	  return true
	end
  end
  return false
end

and then got a array/table with different usernames

usernamecorrect = {
  "kadecamz",
  "Kadecamz",
  "anonomit",
  "Anonomit",
  "Doyle3694",
  "doyle3694"
}

then you can easily combine the input with the function like this

input = read()
if table.contains("usernamecorrect", input) then
  -- code to be executed
end

Doyle3694, on 29 September 2012 - 09:00 PM said:

I'm doing exactly such a program right atm.

Spoiler

local userFile
local passwordFile
local users = {}
local passwords = {}
local passwordEntered
local userEntered
local userNum = 0
local lineRead

function readUsersAndPasswords()
fs.makeDir("passwordFolder")
userFile = fs.open("passwordFolder/users","r")
passwordFile = fs.open("passwordFolder/passwords","r")


lineRead = userFile.readLine()
repeat
table.insert(users,lineRead)
lineRead = userFile.readLine()
until lineRead == nil

lineRead = passwordFile.readLine()
repeat
table.insert(passwords,lineRead)
lineRead = passwordFile.readLine()
until lineRead == nil
passwordFile.close()
userFile.close()
end

function password()
   textutils.slowPrint("Please enter your password "..users[userNum], 15)
   passwordEntered = read("*")
   if passwordEntered == passwords[userNum] then
	  term.clear()
	  term.setCursorPos(1,1)
	  textutils.slowPrint("Password match.", 15)
	  textutils.slowPrint("Welcome "..users[userNum], 15)
   elseif passwordEntered == "retry" then
	  username()
   else
	  term.clear()
	  term.setCursorPos(1,1)
	  textutils.slowPrint("Password missmatch. Please try again.", 15)
	  textutils.slowPrint("Type 'retry' to enter a new username.", 15)
	  password()
   end
end

function username()
   userNum = 0
   term.clear()
   term.setCursorPos(1,1)
   textutils.slowPrint("Welcome", 15)
   sleep(1)
   term.clear()
   term.setCursorPos(1,1)
   textutils.slowPrint("Please enter your username", 15)
   userEntered = read()
   for i=1, #users do
	  if userEntered == users[i] then
   	  userNum = i
		 break
	  end
   end
   if userNum == 0 then
	  textutils.slowPrint("Username could not be recognized. Please try again", 15)
	  username()
   else
	  term.clear()
	  term.setCursorPos(1,1)
	  textutils.slowPrint("Username recognized.", 15)
	  sleep(1)
	  term.clear()
	  term.setCursorPos(1,1)
	  password()
   end
end

readUsersAndPasswords()
username()

end
  

it saves usernames and passwords inside files.. I'm right now coding so that different users can do different stuff.

Really cool code! And really helpful!!

You just got me thinking of making a user system of my own!

also, whenever I view a thread the top half of the screen is black. (bug with the forums, not my code)

And now I am getting a problem with my code on line 16

usernamecorrect = {
  "kadecamz",
  "Kadecamz"
}
correctpassword = {
  "1337",
  "kade"
  }
term.clear()
term.setCursorPos(1,1)
print("User/Access") --just for looks
print("ACCESS DENIED")
term.setCursorPos(17,7)
write("USERNAME: ")
username = read()
if table.contains("usernamecorrect", username) then --Getting "startup:16: attempt to call nil" on this line
print(" ")
write("Reading Username")
textutils.slowPrint("...")
print(username.." is a correct username!")
sleep(3)
term.setCursorPos(17,7)
term.clearLine()
term.setCursorPos(17,7)
write("PASSWORD: ")
password = read()
if password == correctpassword then
write("Reading Password")
textutils.slowPrint("...")
print(password.." is a correct password!")
sleep(3)
term.clear()
term.setCursorPos(1,1)
print("User/Access") --just for looks
print("GRANTED")
sleep(3)
shell.run("granted")
else
write("Reading Input")
textutils.slowPrint("...")
print("Wrong Entry!")
sleep(3)
os.reboot()
end
end

EDIT: Accidental double post.

does it crash when you start the program? or when you type in your username?

When i press enter

When i press enter

The table.contains function doesn't exist. And you can't add it just like that, because the table api is protected. You would have to define a function (with another name, and outside the table api) that has the code jag_e_nummer_ett posted (wich he probably didn't test, since it would throw an error).
So, just add the function before using it, and change table.contains to it's name:

local function table_contains(t, val)
  for _,v in ipairs(t) do
    if v == val then
	  return true
    end
  end
  return false
end
...
if table_contains(usernamecorrect, username) then
...

oh, "usernamecorrect" shall not be in qoutes

MysticT, on 29 September 2012 - 09:32 PM said:

The table.contains function doesn't exist. And you can't add it just like that, because the table api is protected. You would have to define a function (with another name, and outside the table api) that has the code jag_e_nummer_ett posted (wich he probably didn't test, since it would throw an error).
So, just add the function before using it, and change table.contains to it's name:

local function table_contains(t, val)
  for _,v in ipairs(t) do
	if v == val then
	  return true
	end
  end
  return false
end
...
if table_contains(usernamecorrect, username) then
...

Let me ask you this: Did you test it?

Because I did and it worked!

Yeah, I would also like to know this :)/>/>

jag_e_nummer_ett, on 29 September 2012 - 09:53 PM said:

MysticT, on 29 September 2012 - 09:32 PM said:

The table.contains function doesn't exist. And you can't add it just like that, because the table api is protected. You would have to define a function (with another name, and outside the table api) that has the code jag_e_nummer_ett posted (wich he probably didn't test, since it would throw an error).
So, just add the function before using it, and change table.contains to it's name:

local function table_contains(t, val)
  for _,v in ipairs(t) do
	if v == val then
	  return true
	end
  end
  return false
end
...
if table_contains(usernamecorrect, username) then
...

Let me ask you this: Did you test it?

Because I did and it worked!

Hmm… it looks like they removed the global tables protection in 1.42, that's good, it wasn't really needed.
Sorry, I haven't tested 1.42 too much.
Anyway, that's in 1.42, so if someone plays in a previous version it will throw an error saying "Attempt to write to global".

MysticT, on 29 September 2012 - 10:35 PM said:

Spoiler

jag_e_nummer_ett, on 29 September 2012 - 09:53 PM said:

MysticT, on 29 September 2012 - 09:32 PM said:

The table.contains function doesn't exist. And you can't add it just like that, because the table api is protected. You would have to define a function (with another name, and outside the table api) that has the code jag_e_nummer_ett posted (wich he probably didn't test, since it would throw an error).
So, just add the function before using it, and change table.contains to it's name:

local function table_contains(t, val)
  for _,v in ipairs(t) do
	if v == val then
	  return true
	end
  end
  return false
end
...
if table_contains(usernamecorrect, username) then
...

Let me ask you this: Did you test it?

Because I did and it worked!

Hmm… it looks like they removed the global tables protection in 1.42, that's good, it wasn't really needed.
Sorry, I haven't tested 1.42 too much.
Anyway, that's in 1.42, so if someone plays in a previous version it will throw an error saying "Attempt to write to global".

Well in that case, you're right!
So then go with your version

MysticT, on 29 September 2012 - 09:32 PM said:

local function table_contains(t, val)
  for _,v in ipairs(t) do
	if v == val then
	  return true
	end
  end
  return false
end

Oh…I'm in 1.4.1….
sadface

Oh…I'm in 1.4.1….
sadface

Kadecamz, on 29 September 2012 - 11:42 PM said:

Oh…I'm in 1.4.1….
sadface

Oh…I'm in 1.4.1….
sadface

That's why I said that you need to change the name. Making the changes I posted above should work.