airstrike compact computer computercraft

rednet.open("back")
local cords = {}
local id = 0
local conf = false
local loc = "here"
function location()
    term.clear()
    term.setCursorPos(2, 6)
    write(">here<     other ")
    while conf == false do
        term.setCursorPos(2, 6)
        local event, key, isHeld = os.pullEvent("key")
        if key == keys.left then
            write(">here<     other ")
            loc = "here"
        elseif key == keys.right then
            write(" here     >other<")
            loc = "other"
        end
        if key == keys.enter then
            conf = true
        end
    end
end
function question(text)
    term.clear()
    term.setCursorPos(1, 1)
    print(text)
end

while true do

    question("what's the pincode?")
    table.insert(cords, 1, read("*"))
    question("what turtle do you want to send?")
    id = tonumber(read())
    location()
    if loc == "here" then
        cords[2], cords[3], cords[4] = gps.locate()
    elseif loc == "other" then
        question("what's the x cord?")
        cords[2] = read()
        question("what's the y cord the turtle should bomb on?")
        cords[3] = read()
        question("what's the z cord?")
        cords[4] = read()
    end
    question("how much tnt should be dropped?")
    cords[5] = read()

    local message = textutils.serialise(cords)

    rednet.send(id, message, "airstrike")

    local id, feedback = rednet.receive("airstrike")
    print(feedback)
    print("press backspace to exit and press a key to continiue")
    local event, key, isHeld = os.pullEvent("key")

    if key == keys.backspace then
        os.reboot()
    end
end