Refueling script is silent

Background Knowledge:
I'm 100% new to Lua, and relatively new to the practical side of programming. I basically just threw myself into CC a few hours ago, and threw together this script as a test-run.

The script's purpose is to detect how much fuel a turtle requires, and then to fill it up with the appropriate number of Coal Blocks (800 units of fuel)

The Script:

local y = turtle.getFuelLevel()
local totalFuelCap = 100000
local a = True
local slot = 1
y = (totalFuelCap - y)
--[[ COAL BLOCKS ]]--
remainder = y % 800
y = (y - remainder) / 800
if y ~= 0 then
  turtle.select(slot)

  while a do
	if y <= 64 and y > 0 then
	  turtle.refuel(y)
	  print("All filled up!")
	  a = False
	elseif y > 64 then
	  turtle.refuel()
	else
	  print("Left your zipper open.")
	  a = False
	end
  
	slot = slot + 1
	turtle.select(slot)
  end
else
  print("The tank's already full!")
end
turtle.select(1)

My Problem:
I like debugging. And I've already had to debug a few little errors I made because of my inexperience with Lua. BUT, when I run this script, I get no response from the console. It seems to run, but nothing happens…which seems impossible, because as I see it, every possible route the program could have taken would have resulted in SOME sort of output to the console.

What I've Done:
I've looked it over a couple dozen times and swapped some stuff around and tried commenting out a few things, but I always end up back here. I can google and backtrack if I've got an error, but I'm kind of at a loss with this one, since it looks perfectly fine to me. I figured with a program this simple, it's most likely blatantly obvious for someone more experienced (either in Lua or in CC ), so I figured I'd ask here for help.

Anyways, thanks in advance.

P.S. Oh, and on an unrelated note, how does one make a spoiler? This site seems to be using unconventional bbcode for the spoiler tag (or it just doesn't show up in the 'Preview Post'…which is possible too).

You're code looks very good for someone who's only been into it for a few hours :)/> however, you do have an issue with your while loop.

a = True
...
while a do
   ....
end

Note the capital letter in "True". In Lua, booleans (true/false) are lowercase. What this means is that your program sees a as "nil" and your while loop is skipped over entirely, and in the process all of the printed statements are skipped as well.

As to the spoiler, you can simply use:

[spoiler]
Content here
[/spoiler]

Spoiler

Hello, world!

Bubba, on 31 May 2014 - 01:23 AM said:

Thank you! I guess book knowledge translates to practical knowledge a bit easier than I imagined it would.

Ah, I see…that makes sense. Thanks for the help…I'm glad it was that simple. I tried it, and it works like a charm now!