Unknown failure in code and while not give a reason

for i = 1, 100 do
  turtle.forward()
end

x=100
while x=100 do  -- You need to specify "do" here.
.              
.
.
x=x+1     -- This while "loop" will run exactly once, 'cause now x = 101, not 100.
end

while x=200  -- There's no way x will equal 200 at this point. It can only be 101. So this "loop" won't run at all.
.
x=x+1	
end

Bomb Bloke, on 10 June 2013 - 11:22 AM said:

x=100
while x=100 do  -- You need to specify "do" here.
.			  
.
.
x=x+1	 -- This while "loop" will run exactly once, 'cause now x = 101, not 100.
end

while x=200  -- There's no way x will equal 200 at this point. It can only be 101. So this "loop" won't run at all.
.
x=x+1	
end

while x == 100 do

Lyqyd, on 10 June 2013 - 04:17 PM said:

I'm beginning to think that either nobody reads what I write in my "split" posts, or I'm being too understated in my suggested corrections. :P/>

commanderbass, on 10 June 2013 - 10:22 PM said:

* snip *

while x>99 do
.
.
.
x=x+1	
end

for i=1,100 do

  for j=1,4 do
    turtle.dig()
    turtle.turnLeft()
  end	

  turtle.digDown()
  turtle.down()
end

Bomb Bloke, on 11 June 2013 - 04:06 AM said:

In addition to the equals sign thing, the code logic is still messed up. This:

while x>99 do
.
.
.
x=x+1	
end

… has an issue where 'x' will always be more then 99. You can keep incrementing it all you like, but that won't ever change (… depending on how Lua handles overflows, I suppose, but don't worry about that. ;)/> ).

Here's another example of how 'for' loops might come in to play here:

for i=1,100 do

  for j=1,4 do
	turtle.dig()
	turtle.turnLeft()
  end	

  turtle.digDown()
  turtle.down()
end

The first time the left-most 'for' block runs, 'i' is set to 1. When the block completes, it automatically runs again, and 'i' is incremented by 1. This continues until 'i' would exceed 100, at which point the program continues from the bottom of the 'for' block.

The nested 'for' loop uses 'j' to track four iterations of the digging/turning process.

x = 100
while x == 100 do
  x = x + 1
end

x = 100

while x > 99 do
  x = x + 1
end

while x > 199 do
  x = x + 1
end

for i = 1, 100 do --# Loop from one to one hundred
  turtle.forward()
end

Lyqyd, on 11 June 2013 - 12:45 PM said:

That was pretty simple, if you take the time to read it carefully. Essentially, though, a while loop will only keep looping while its condition evaluates true. So a loop like:

x = 100
while x == 100 do
  x = x + 1
end

Will only run once. The first time the loop starts, x is 100, so its condition ( x == 100 ) is true. Then in the loop body, we add 1 to x, making it 101. When the loop tries to start again, its condition evaluates to false (101 does not equal 100), so it skips the loop and moves on. Your next attempt was something like:

x = 100

while x > 99 do
  x = x + 1
end

while x > 199 do
  x = x + 1
end

The issue here is that your first loop will never end. When the first loop begins, x is greater than 99. Since the loop adds one to x, it will always be greater than 99, so that first loop will keep looping forever. That code will never reach the second loop. So we suggested you use a for loop instead. For loops can be made to loop a specific number of times, which is what it seems like you're looking for. Something like this:

for i = 1, 100 do --# Loop from one to one hundred
  turtle.forward()
end

Bomb Bloke, on 12 June 2013 - 03:59 AM said:

Putting aside the number of 'end' statements in there for the moment (there should be an extra one at the bottom to finish the function!), the above will work up until the end.

The first 'for' loop will run a hundred times, by which time 'x' will have incremented to a total of 200. The second 'for' loop will try to move the turtle up a hundred times, at the end of which 'x' will be 300.

The final 'while' loop won't work at all because you've omitted the 'do' again. If you add that in there it'll run forever, as you don't change 'x' further, and so it'll always be 300.

Lyqyd, on 12 June 2013 - 10:33 AM said:

Are you calling the function?

Engineer, on 12 June 2013 - 12:41 PM said:

Right now you only have the function. This on its own does nothing, you have to actually call it before that code runs. Just like Lyqyd already pointed out

function hi()
  print("hey")
end

hi()

Lyqyd, on 12 June 2013 - 12:42 PM said:

Sounds like you're not calling the function. You declare all this code in a function body in your file, but then never call the function. Try putting this below everything else in the file:

testsoil()

Engineer, on 12 June 2013 - 01:27 PM said:

function hi()
  print("hey")
end

hi()

Edit: I didnt notice you Lyqyd! D:

Lyqyd, on 12 June 2013 - 12:42 PM said:

Sounds like you're not calling the function. You declare all this code in a function body in your file, but then never call the function. Try putting this below everything else in the file:

testsoil()

That is basically it :)/>