CODEWITHSUNDEEP
luaminecraftcomputercraft
cmd
cmd

Reputation: 583

Lua Programming with ComputerCraft

I have created a small program that asks for the length width and heights that you wish a mining turtle to mine. When I run it in the advanced computer though, It lets me prompt for the length, width and height but then I get an error. The error is as follows:

miner:39: attempt to index ? ( a nil value)

Here is my code:

term.clear()
term.setCursorPos(1,1)





write("Length:")
length = read()
print()
write("Confirm:")
ul = read()
print()

write("Width:")
width = read()
print()
write("Confirm:")
uw = read()
print()

write("Height:")
height = read()
print()
write("Confirm:")
uh = read()
print()

local totcount = ul + uw + uh
local subcount = 0




function Length()

repeat 

    turtle.dig()
    turtle.forward()
    length = length - 1
    subcount = subcount + 1

until length == 0
length = ul

end

function Width()

repeat

    turtle.dig()
    turtle.forward()
    width = width - 1
    subcount = subcount + 1

until width == 0
width = uw
end

function Height()
turtle.digDown()
turtle.down()
height = height - 1
subcount = subcount + 1
end

function Turn()

turtle.turnRight()

end



repeat

Length()
Turn()
Width()
Turn()
Length()
Turn()
Width()
Turn()
Height()

until subcount == totcount

Upvotes: 1

Views: 1125

Answers (1)

Oliver
Oliver

Reputation: 29453

It doesn't look any of your functions have end, fix that first. If you properly indent your code you will see this.

You also have while count < length do with an else block. AFAIK this is not valid syntax (never seen it and just checked online ref manual and wiki). It is not clear whether you meant if count < length do, but if really meant while then replacing else by end doesn't look right either. Take a closer look at that section of code.

Upvotes: 2

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