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Review of the Basics Videos 19 videos

AP Computer Science 1.1 Review of the Basics
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AP Computer Science: Review of the Basics Drill 1, Problem 1. What does this piece of code output?

AP Computer Science 1.5 Review of the Basics
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AP Computer Science: Review of the Basics Drill 1, Problem 5. Which code will run without throwing an exception?

AP Computer Science 2.1 Review of the Basics
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APCS: Review of the Basics Drill 2, Problem 1. What is the output of the code segment?

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AP Computer Science 1.4 Review of the Basics 183 Views


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Description:

AP Computer Science: Review of the Basics Drill 1, Problem 4. What is 11001 (base 2) in base 10?

Language:
English Language

Transcript

00:00

Thank you We sneak and here's your smoke du jour

00:05

You know there's an old saying there ten types of

00:08

people in the world those who understand binary and those

00:11

who don't and a about eight others Okay what is

00:17

one one oo one bass two in based hand And

00:21

here your potential answers All right Okay So here we

00:26

go At first thought it can seem pretty out there

00:30

Well it turns out your computer does it all the

00:32

time Every piece of information and computer deals with whether

00:35

it's numbers text or a photo of grandma is stored

00:38

in memory as a huge pile of ones and zeros

00:41

Well wonders of technology aside let's read a small base

00:44

to number and converted to base ten ourselves As we

00:47

know each one or zero is a bit And each

00:50

group of eight bit is a fight in a bite

00:54

Not everyone in zero is created equal Each bit in

00:57

a bite carries a different value Well the first bit

01:00

to go from right toe laugh when counting these things

01:02

represents the value of one Next is two and four

01:06

eight sixteen thirty two six four seven one twenty eight

01:10

We just add up the values that ones and you

01:12

can get any numeric value anywhere from zero to two

01:15

hundred fifty five into gold base ten the bite shown

01:18

here one one one zero one zero zero one equals

01:23

two hundred thirty three So here's the one one zero

01:26

zero one we were given for this question We've only

01:28

been given five bits out of this bike so the

01:31

trailing space gives filled in with zeros Well that first

01:35

bit represents one in the two and four positions We've

01:38

got zeros which don't count The fourth and fifth bits

01:41

with values of eight and sixteen are ones and one

01:45

plus a plus sixteen Well in california that twenty five

01:48

which is answered the knot too complicated Right so give 00:01:52.39 --> [endTime] yourself one of thumbs up Whoa

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