Redstone Binary Subtraction - LRR #5

In this episode, we explore negative number formats and build a toggleable adder/subtractor.

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0:00 Introduction
1:01 Signed Magnitude
3:08 Modular Arithmetic
6:23 Two's Complement
8:56 Building a Subtractor
9:46 Building a Toggleable Adder/Subtractor
11:30 Sentiment
12:34 Another Cool Fact
13:08 One's Complement
13:37 Subscribe!

Music (in order):

[CraftyMasterman]

lrr is such a force of nature, not even SICKNESS could stop HIM!!!

[rodrigoqteixeira]

GUYS WE FINALLY KNOW WHY INVERTING AND ADDING 1 WORKS!!! I'M SO HAPPY :)

[ok-y-pull-up]

Matt explains the most complex thing so well is not normal

[IceMetalPunk]

As a developer with a computer science degree, I of course knew about two's compliment; but I never stopped to wonder *why* the conversion algorithm of "invert + 1" works. When you showed the algebraic connection to modular arithmetic, my mind was blown. Thank you for the education! 🙂

[billydrink]

I don't even like minecraft. I'm a computer scientist and these videos are a really entertaining way of relearning what I already know in a new environment. Great work!

[lewismassie]

12:40 You can also see how thinking about the last bit has a negative value shows the inversion by the series of numbers counting up from negative 8.

[bluelego]

Au-delà de l'aspect Minecraft, c'est même super bien expliqué sur l'aspect de l'informatique

bien joué à toi et bisous de France

[higgs]

CS student here; great videos. It was by sheer chance I happened to watch one of these before my first class on low level computing, and now I always hear my professor talking about the things you do here. Really well done.

[samuelbudzinak]

Love that veritasium music when explaining using clock

[UnPandaOrange]

Great revision of my comp sci classes with a Minecraft aspect on top, love it!

[Strky]

I learn more in 1 min 30s with this video than in 5 years of school with professors

[nickdraddy]

I've been putting off learning redstone since i was a kid, this series is the only time it's ever made sense lmao. I got a better understanding of binary from this series than any of my classes in college.

[capsey_]

It's kinda weird to me that you learned two's complement using modular arithmetic before learning the negating most significant bit trick. I learned it other way around and, honestly, your way is probably better, because knowing math behind why it works is better than just blindly use the trick.

[eliasthememelord]

This video actually made me understand Why two’s complement exists and why it works! Thank you from a current computer science major

[treesmaofficial]

this is the first time I'm actually enjoying math class

thank you for these videos

[toblobs]

Great vid as always, keep up the work Matt

[soundest]

This is the best explanation of 2’s Complement I’ve heard so far! Thank you!

[Rexus]

This series is incredible!

Recently decided I wanted to learn redstone in its entirely, and although this focuses more on redstone logic instead of the whackier items like pistons, skulk, and observers. I really feel like this is foundational knowledge that I'll be able to take advantage of in future projects and learnings.

Absolutely amazing work, my man, thank you.

[ArbitraryCodeExecution]

oh I didnt know the trick to interpret two's complement numbers, that's great!

[vieuxslave]

Learnt about Two’s complement in GCSE, they never explained why it worked or anything, love this video for that, I finally understand where it comes from! Thank you!