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

function stopProgram()
    print("(Hold Ctrl+T to end program.)")
end

function askLWD()
    print("Enter numerical values that are greater than one for the following.")
    write("Lenght: ") L = tonumber(read())
    write("Width : ") W = tonumber(read())
    write("Depth : ") D = tonumber(read())
end

function digDepth()
    if width % 2 == 0 then
        while turtle.detectUp() do
            turtle.digUp()
            os.sleep(.5)
        end
        if depth ~= D then
            turtle.up()
        else
        end
    else
        while turtle.detectDown() do
            turtle.digDown()
        end
        if depth ~= D then
        turtle.down()
        else
        end
    end
end

function digRight()
    if width ~= W then
        turtle.turnRight()
        while turtle.detect() do
            turtle.dig()
            os.sleep(.5)
        end
        turtle.forward()
        turtle.turnLeft()
    else
        while turtle.detect() do
            turtle.dig()
            os.sleep(.5)
        end
        turtle.forward()
    end
end

function digLeft()
    if width ~= W then
        turtle.turnLeft()
        while turtle.detect() do
            turtle.dig()
            os.sleep(.5)
        end
        turtle.forward()
        turtle.turnRight()
    else
        while turtle.detect() do
            turtle.dig()
            os.sleep(.5)
        end
        turtle.forward()
    end
end

clear()
stopProgram()
print("Place the turtle 'IN THE BLOCK' that is top left corner of the room facing the direction that will be the lenght of the room.")
print("Press enter to continue...")
read()
clear()
stopProgram()
askLWD()
while type(L) ~= "number" or type(W) ~= "number" or type(D) ~= "number" do
    clear()
    stopProgram()
    print("Error... You must enter a valid number greater than zero for all 3 values.")
    askLWD()
end
print("The room will be "..L.." in lenght,"..W.." in width &"..D.."in depth.")
print("Press enter to begin creating room.")
stopProgram()
read()

for lenght = 1, L do
    for width = 1, W do
        for depth = 1, D-1 do
            digDepth()
        end
        if lenght % 2 == 0 then
            digLeft()
        else
            digRight()
        end
    end
end