Name: CS50 2019 - Lecture 0 - Binary Bulbs
Uploaded: 2020-04-15T18:36:14.000Z
Duration: 3 min 1 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

The imperative

perhaps we could get, Say two volunteers.

Okay, so one hand here and one hand over here.

If you want to meet me on the other end of the stage.

Come on over and say if you want to wait right here and what's your name?

Do you want to go first or second in this little challenge ahead?

Okay, so Priyanka is gonna go first if you want to stand over there.

So the challenge ahead here is could you go ahead and represent for us in binary?

Using each of these light bulbs and in turn, switches a zeros and ones say the number 50 they might turn one light bulb on representing the 30 two's place might turn a lipo von representing the eights place or total count now is 32 plus not eight plus 16 I think.

Which is going to give us 32 plus 16 which is 48.

So each of these lightbulbs then represents just a switch orbit and inside of your computer.

If you've ever heard the phrase transistor, a transistor is just a tiny little switch and our computers that they have millions or billions of these switches that they use physically to represent information in store values, just like Priyanka did here.

So if a computer were to represent the number 50 it would literally turn on three switches of sorts.

Store a little bit of electricity here, here and here to represent the number 50.

And it would leave off all of the other switches.

In this case, if we're using eight bits or one bite Calvin, you raise your hands seconds, and so we have one other challenge ahead.

Fortunately, these things are magnetic, so let's take things up a notch.

And if you would Calvin, how about the number 13 if you will?

How would a computer represent the number 13 where each of these light bulbs from one toe 128 represents a bit we had of course, the ones place over here.

Should we turn on for instance, this bulb here.

Okay, so we have 1248 four gives us eight plus four is 12 and another round of applause.

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CS50 2019 - Lecture 0 - Binary Bulbs

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