Name: Coding Challenge #119: Binary to Decimal Conversion
Uploaded: 2020-04-06T08:05:04.000Z
Duration: 28 min 51 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...

Future simple

- Hello and welcome to what will undoubtedly be

The superlative

the longest video you've ever watched about binary numbers.

So I made a coding challenge number 117 called

the Seven Segment Display and what I was doing

was creating a visual, a JavaScript, HTML, canvas version

of the Seven Segment Display and to do that,

made no sense to anybody and I tried to explain it

but I got a lot of comments saying I didn't get

what this was so this is bit shipping and bit masking.

So before I can even get into that, I thought let's take

a deep breath and let's just enjoy and go back,

when we didn't have anything but binary numbers

and we had to program everything in binary,

but I can imagine there was a time when this really happened

so this is a coding challenge where I will explain

what binary numbers are and then I will create a sketch,

Okay so maybe you're even asking right now

what is a binary number, what is a decimal number?

a term that refers to the number of possibilities

in a counting system, in a number system.

So base 2 or binary, there are only two possibilities,

or decimal has 10 possibilities, zero through nine.

There are other well-known numbering systems

that get used often, probably the one you see

in computing the most is base 16 or hexadecimal

and this actually has 16 possible digits,

so when you see something like this in CSS

this is a representation of the color red of 255,

so this kind of encoding of information exists

and by the way in my seven segment display,

of what should be displayed on the seven segment display.

I'm not going to do hexadecimal conversion in this video

I think base 8 is used for some file systems

If you have base 4, you just have four possibilities,

And when I say possibilities, this defines how you count.

And by the way, historically there are all sorts

I believe, I was looking, Aztecs used maybe units of zero

and instead of digits, they were actually drawings

of what, so anyway, so you can look that up,

somebody will make a nice explainer YouTube video

of counting systems but if we have base 2,

this means there are only two possibilities.

Let's use base 10 decimal 'cause we understand that.

10 fingers, 10 toes, that's why base 10 is the convention.

Zero, one, two, three, four, five, six, seven, eight, nine,

10, 11, 12, right 'cause once we get to nine,

we've run out of possibilities in a single digit

so we switch to zero and then the next digit over,

This is what kids learn in elementary school

in counting in groups of 10, hundreds units, et cetera.

All right but if I were doing this in binary,

I have no more digits left, so I have to say one zero

and then one one and then, uh oh, one zero, zero,

and then one zero zero zero, did I get that right?

One zero zero, one zero one, one one zero,

then one one one and then one zero zero zero.

Okay let me match up some things for you.

So something that's really interesting here

Subtitles ListPlay Video

Coding Challenge #119: Binary to Decimal Conversion

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