Loops

What are loops? They are instructions that repeat What are loops? They are instructions that repeat What are loops? They are instructions that repeat What are loops? They are instructions that repeat Computers love to repeat things And they never get bored! Loops tell them what to repeat And repeat some more! And loops will also help To save a lot of time By repeating many things So you don't have to keep writing Line after line, after line, after line, after line Now let's say you got a robot friend here And you want to teach it to climb the stairs You can't just say go climb those stairs Cuz' it's not gonna know what to do when it's there You gotta be specific, give it a try Left leg up, forward, down Right leg up, forward, down Left leg up, forward, down Right leg up, forward, down Left leg up, forward, down Right leg up, forward, down Left leg up, forward, down Right leg up, forward, down Left leg up, forward, down Right leg up, forward, down Left leg up, forward, down Right leg up, forward, down I did it! Well that's all good, the robot got to the top But hold on a minute, that's right stop! You said a lot of the same things again and again Is there a better way to say everything? Yes there is, that's where a loop comes in Ah thanks loop, what a great friend! Instead of writing everything many many times You put it in a loop and write it one time Set up a loop, put the stuff inside Then there's only one thing left to decide That's to tell the loop how many times to repeat Yep that's it, the loop is pretty much complete So let's return to our robot climbing the stairs, OK We got the steps in a loop And soon it's on it's way But let's add other stuff in the loop for fun today How about we get the robot to shout hooray! Alright, let's run the loop and see what happens Left leg up, forward, down Right leg up, forward, down, hooray! Left leg up, forward, down Right leg up, forward, down, hooray! Left leg up, forward, down Right leg up, forward, down, hooray! Left leg up, forward, down Right leg up, forward, down, hooray! Left leg up, forward, down Right leg up, forward, down, hooray! Left leg up, forward, down Right leg up, forward, down, hooray! What are loops? They are instructions that repeat (Three more) What are loops? They are instructions that repeat (Two more) What are loops? They are instructions that repeat (One more) What are loops? They are instructions that repeat (No more)