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AP Computer Science 4.4 Review of the Basics 181 Views
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Description:
APCS: Review of the Basics Drill 4, Problem 4. Which of the following correctly creates the string "milk"?
Transcript
- 00:00
Sorry Man here's your smoke to your reminding you that
- 00:05
there is no i in team But there is an
- 00:08
i in milk Great for the skin You should try
- 00:11
it That's Great Given the following string declaration string a
- 00:17
equals m l k which of the following correctly creates
Full Transcript
- 00:22
the string milk And here the potential answers you Well
- 00:29
this question is asking us which of the five potential
- 00:31
answers would turn mlk into milk and goes about it
- 00:35
in a couple of different potential waste the first method
- 00:38
used in options and be used the strings indexes to
- 00:42
attempt to build milk one character at a time a
- 00:45
strings index numbers are a bit like having a card
- 00:48
catalog Each string has an index beginning with zero and
- 00:51
continues counting each character until the end of the string
- 00:53
including punctuation marks in spaces The strength frogs and toads
- 00:58
for example has an index from zero to fourteen and
- 01:01
if you pulled index ten you'd get the character teeth
- 01:05
All right let's try out what options and beer proposing
- 01:08
string a mlk has an index that would look a
- 01:11
little like this if we were to visualize it option
- 01:14
a attempts to build milk by first selecting index one
- 01:18
of m l k and that's letter l so this
- 01:21
is definitely not right Option b starts with index zero
- 01:24
which is m could start that it adds the necessary
- 01:28
i and then leaps to index three and four which
- 01:33
don't exist option c thru use the sub string method
- 01:38
which uses what we already know about indexes to select
- 01:41
a range of characters from a string rather than just
- 01:44
one at a time If we wanted to grab toads
- 01:46
from frogs and toads waken use sub string method with
- 01:49
the parameters ten as they begin index and fifteen is
- 01:52
the end index so we start here and in here
- 01:55
to grab everything in that range up to fifteen still
- 01:58
it's try option c we start by grabbing the subs
- 02:01
string from index zero one which gets us the m
- 02:03
there we go remember the end index goes up to
- 02:07
but does not include the index number given that we're
- 02:10
only going up to index one here and not including
- 02:13
it so we don't get the l then we insert
- 02:17
the eye okay and insert a sub string from index
- 02:20
one two three that's l and kay and we've done
- 02:23
it We've got milk looks like cy's gonna be our
- 02:26
answer But let's look at what's wrong with dna just
- 02:28
to be sure All right Well d starts with grabbing
- 02:31
a sub string at the index is zero and zero
- 02:33
of course the end index only goes up to but
- 02:36
does not include the character reference though Starting at zero
- 02:40
and going up to zero without including it gets us
- 02:42
a whole lot of nothing No m no milk option
- 02:46
E does practically the same thing A sub string at
- 02:48
the index is one and one that starts us an
- 02:50
l here and then goes up to but does not
- 02:53
include l So again we get a whole lot of
- 02:55
nothing And option c It is chocolate chip our favorite 00:02:59.228 --> [endTime] baby Yeah
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