8 replies to this topic

[Heliomance]

I've got a program with a

while true

loop in it. All well and good, but now I need to edit the code and I can't work out how to stop the program running. Do I have to break the turtle and put it down again?

[Kilobyte]

There are 2 ways:
If you just wanna break the loop, use break:

while true do
    stuff()
    if someCondition then
	    break -- here
    end
end

If you want to just stop the current program manually hold ctrl + t for at least 1 second. you can also use ctrl+s to shut down the turtle/computer or ctrl+r to reboot it

[Exerro]

break breaks a loop

while true do
	 event = os.pullEventRaw( )
	 if event == "terminate" then
		 break
	 end
end

edit: damn ninja'd

edit 2:
you can also use return but that will exit the currently executing function or the program if there is no function running

[SadKingBilly]

You mean break out of the loop programatically, or just terminate the program? If you just want to stop the program, open up the turtle and hold Ctrl+T. If you want to break out of the loop within the program, then there are several things you can do. The simplest would be to use the "break" keyword. But some consider that bad practice. For while loops, it's better not to use "while true do" if you aren't looking for an infinite loop.

[Kilobyte]

Actually sometimes a while true loop is easier. i usually use it when reading from streams. Java example when reading from a socket:

String s = "", line;
while (true) {
    line = reader.readLine();
    if (line == null) break;
    s += line;
}

see what i mean? But yeah, usually its better to not use while true

[TheOddByte]

awsumben13, on 08 April 2013 - 10:40 AM, said:

break breaks a loop

while true do
	 event = os.pullEventRaw( )
	 if event == "terminate" then
		 break
	 end
end

edit: damn ninja'd

edit 2:
you can also use return but that will exit the currently executing function or the program if there is no function running

You could also do something like this

bla = true
while bla do --This means only does the loop when bla is true and if it turns false it breaks from the loop
	input = read()

if input == "Hello" then
   print("Hello!")
	  sleep(1)

elseif input == "Bye" then
   print("Bye!")
sleep(1)
   bla = false --Here it breaks the loop

else
print("What?")
sleep(1)  

end --'if' statement
	 end --'while <condition> do' loop

[Kilobyte]

Yes, but if you instantly wanna leave the look break is your friend. also break can break for loops which your solution can't

[Spongy141]

you can just do a for loop, so it will break at your given point.

[TheOddByte]

Spongy141, on 21 April 2013 - 02:09 PM, said:

you can just do a for loop, so it will break at your given point.

for i = 100, 1, -1 do
  term.clear()
    term.setCursorPos(1,1)
  print("Seconds to something awesome: "..i)
end

  term.clear()
    term.setCursorPos(1,1)
       print("Fooled Ya!")
   sleep(1)
 os.shutdown()