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so the final major concept we're going
[Evans] The final major concept we're going to introduce in this unit
to introduced in this unit is how to
is how to loop through a list.
loop through a list since loops are collections of things it's very useful
Since loops are collections of things, it's very useful to be able to go through a list
to be able to go through a list and do something with every element of the list
and do something with every element of the list.
so with the things we know so far we
With the things we know so far, we already know enough to do this
already know enough to do this if we put them together in the right way
if we put them together in the right way.
you should remember the while loop from
You should remember the while loop from the previous unit.
the previous unit and as a reminder this
And as a reminder, this is the way the while loop works.
is the way the while loop works we have a while followed by a test expression
We have a while followed by a test expression,
which is something that evaluates to
which is something that evaluates to true or false.
true or false and when it evaluates to a true value that means to execute the
And when it evaluates to a true value, that means to execute the block,
block which can be a block of any number
which can be a block of any number of statements we want.
of statements we want and then at the end of the block we continue go back to
And then at the end of the block we continue, go back to the while loop,
the while loop try the test again and we keep executing the block as long as the test evaluates to true so for this quiz
try the test again, and we keep executing the block as long as the test evaluates to true.
we're gonna see if you can figure out
So for this quiz we're going to see if you can figure out how to use while
how to use while to go through the
to go through the elements of a list.
elements of a list we're gonna provide most of the code for you our goal is to
We're going to provide most of the code for you.
define a procedure called print all
Our goal is to define a procedure called print<u>all</u>elements
elements that takes as input a list will
that takes as input a list.
use the name P for the list and our goal
We'll use the name p for the list.
is for that procedure to print out every
Our goal is for that procedure to print out every element in the list.
element in the list and I've written most of the code for this for you but
I've written most of the code for this for you,
I've left out the test expression for
but I've left out the test expression for the while.
the while so the code that's written introduce a variable named I initializes
So the code that's written introduces a variable named i,
this value to zero and we're going to use I to index through the elements of
initializes this value to 0, and we're going to use i to index through the elements of the list.
the list for each element we print out that value and then we increase I plus 1
For each element we print out that value, and then we increase i + 1.
so can you figure out the test
So can you figure out the test expression we need for the while
expression we need for the while to make
to make print<u>all</u>elements work,
print all elements work and what print all elements should do is print out every element in the input list P
and what print<u>all</u>elements should do is print out every element in the input list p.
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