help with password lock program?

Hi,
i am learning computercraft programming and i decided to try and modify the password lock doors program. I want it to read out failed attempt(number of attempts go here) then once 3 wrong attempts have a curred it will send a redstone signal to a tnt block thus destroying the house and the person trying to enter the password. However i'm not sure how to make it print out the attempts the rest I can do my self, i think.

Split into new topic.

You are in the Members group and should have been able to post your own topic.

well you'll need to do something like this. So when the password is wrong it adds 1 to itself, and when it reaches 3, with your code, it will make the house and the person trying to get in blow up. And when the password is correct it resets the attempts to 0, so you wont blow up your house if the password fails three times, three different times.

attempts = 0
while true do
  write('Password: ')
  local pass = read('*')
  if pass == '123' then
    attempts = attempts - attempts
    --do stuff when correct.
  elseif pass ~= '123' then
    attempts = attempts + 1
  elseif attempts >= 3 then
    --do house blow up stuff
  end
end

Might want to edit that - the "blow up stuff" bit will never get called unless you completely end the previous if/elseif block and then start a new one.

Here is the fixed code:

attempts = 0
pass = "CorrectPassword"
while true do
  term.clear()
  term.setCursorPos(1,1)
  print("Attempts: "..attempts.."/3") --# The ..attempts.. concatenate the string with the string the variable contains
  write("Password: ")
  local input = read('*')
  if input == pass then
	attempts = 0
	--open door
  elseif attempts >= 3 then
	--boom boom
  else
	attempts = attemps + 1
  end
end

Useful link: http://computercraft.info/wiki/Concatenation

Thanks so much for the help, i've managed to get it to work perfectly heres the finished product in action and the full finished code.

https://www.youtube.com/watch?v=7dgMvh6KYfM

and the code which could probably be cleaned up slightly but I'm rubbish at coding:


local atm = 0

while true do
term.clear()
term.setCursorPos(1, 1)
write("enter password: ")
ps = read()
if ps == "123" then
atm = atm - atm
redstone.setOutput("left", true)
sleep(2)
redstone.setOutput("left", false)
else
atm = atm + 1
print(atm.." attempts")
sleep(1)
if atm >=3 then
redstone.setOutput("back", true)
end
end
end