Combing three simple programs into one

a = math.random(1,2)
if(a == 1) then
  print("1")
elseif(a == 2) then
  print("2")
end

Yami said:

When accepting user input, you can do multiple comparisons using an elseif. I would also recommend toggling input, rather than asking for on, then off.

If you have any trouble with either of these, I've written up a short example:

Spoiler

--#You don't have to draw each loop if the text doesn't change.
term.clear()
term.setCursorPos( 1, 1 )
print( "P - toggle pink" )
print( "B - toggle blue" )
print( "U - toggle purple" )
print( "To exit, press any key" )
--#we should loop while waiting for user input
while true do
  local event, userinput = os.pullEvent( "char" )
  userinput = userinput:upper() --# syntactical sugar for string.upper( userinput )
  if userinput == "P" then --# we can have an if / elseif statement for multiple comparisons
    rs.setOutput( "left", not rs.getOutput( "left" ) ) --# rs.getOutput returns whatever the current output is.  Not inverts that value
  elseif userinput == "U" then
    --#here you would toggle purple side
  elseif userinput == "B" then
    --#here you would toggle blue side
  else --# if none of the comparisons match, it must be a different key, and we should exit
    break
  end
end
--#after exiting the loop, we can do some cleanup
term.clear()
term.setCursorPos( 1, 1 )

PS: Thanks for indenting your code. It's really helpful ;)/>