If not input do nothing?

I'm pretty new to all this coding and such and one thing I'm good at is if / else commands. One thing I've been dying to know is that how I could make something like this work (just an example):

if input == "y" then
	  print("Hi")
	  sleep(2)
end
if input == "n" then
	  print("Bye")
	  sleep(2)
end
if input ~= "y" or if input ~= "n" then
--do nothing? how?nput = read()

Basically I want it to do something that if the input isn't y or n then it would let the user try again and input one of the options. How can I do this in the easiest way possible?

The easiest way is by using the elseif and else keywords:

if input == "y" then
  --# yes
elseif input == "n" then
  --# no
else
  --# all other input
end

It seems like now is the time to show you loops!

local input
repeat
  input = read()
until input == "y" or input == "n"
if input == "y" then
  --#Do stuff
elseif input == "n" then
  --#Do stuff
end

Dragon53535, on 02 December 2015 - 01:56 AM said:

It seems like now is the time to show you loops!

local input
repeat
  input = read()
until input == "y" or input == "n"
if input == "y" then
  --#Do stuff
elseif input == "n" then
  --#Do stuff
end

Wow! That's very easy. "until". Thank you very much! <3