Video wird geladen...

Video konnte nicht geladen werden

Zur Startseite

You cannot add to a void pointer in C. The compiler does not know the size. The everyday fix is to cast it to char* so the math is in bytes, then multiply by the element size yourself. Stanford CS107, lecture 4

tetsuoai's profile picture

tetsuo

237,170 subscribers

25,772 Aufrufe • vor 25 Tagen •via X (Twitter)

Wissenschaft & TechnologieBildungGesundheit & Wellness
LIVE

Anya Rossi• Live Now

Private livecam show

0 Kommentare

Keine Kommentare verfügbar

Kommentare vom Original-Post werden hier angezeigt

Ähnliche Videos

In C, `array[i]` does not add i to the address. It adds i times the size of one element. Assembly has to do that multiply. C hides it. Stanford CS107, lecture 9.
0:44

In C, `array[i]` does not add i to the address. It adds i times the size of one element. Assembly has to do that multiply. C hides it. Stanford CS107, lecture 9.

tetsuo

69,736 Aufrufe • vor 25 Tagen

To build a generic swap in C, pass the size explicitly, create a temporary byte buffer, then use memcpy three times to rotate the bit patterns. VLA char buffer[size] is a GCC thing, for a more portable version malloc the temp and free it. Stanford CS107, lecture 4
6:54

To build a generic swap in C, pass the size explicitly, create a temporary byte buffer, then use memcpy three times to rotate the bit patterns. VLA char buffer[size] is a GCC thing, for a more portable version malloc the temp and free it. Stanford CS107, lecture 4

tetsuo

45,838 Aufrufe • vor 23 Tagen

This is a common C bug. You write a MAX macro, then call MAX(m++, n++). The preprocessor pastes the text, so it becomes (m++ > n++) ? m++ : n++. The smaller one increments once. The larger one increments twice. Stanford CS107, lecture 12
1:04

This is a common C bug. You write a MAX macro, then call MAX(m++, n++). The preprocessor pastes the text, so it becomes (m++ > n++) ? m++ : n++. The smaller one increments once. The larger one increments twice. Stanford CS107, lecture 12

tetsuo

29,513 Aufrufe • vor 24 Tagen

New Plumber Module for Midnight Decor Catalog: Size Reference - Gauging the object dimensions from the Catalog UI is hard. It's better to see its size before getting your hands on it. So we add a size reference, a banana in this case, to the preview window.
0:20

New Plumber Module for Midnight Decor Catalog: Size Reference - Gauging the object dimensions from the Catalog UI is hard. It's better to see its size before getting your hands on it. So we add a size reference, a banana in this case, to the preview window.

Peter Yu

32,901 Aufrufe • vor 10 Monaten

LEGENDARY STANFORD CRYPTOGRAPHER JUST SAID QUANTUM COMPUTING COULD REOPEN THE #BITCOIN BLOCK SIZE WARS "THE SIGNATURE COST IS GONNA GO UP BY 10x" "THEY ARE HUNDREDS OF BYTES" “SOME WITHIN THE CORE DEVS ARE SAYING WE’RE GONNA HAVE TO INCREASE THE BLOCK SIZE” "HOW THEY ACTUALLY DEAL WITH IT IS CURRENTLY UNKNOWN" 👀
1:51

LEGENDARY STANFORD CRYPTOGRAPHER JUST SAID QUANTUM COMPUTING COULD REOPEN THE #BITCOIN BLOCK SIZE WARS "THE SIGNATURE COST IS GONNA GO UP BY 10x" "THEY ARE HUNDREDS OF BYTES" “SOME WITHIN THE CORE DEVS ARE SAYING WE’RE GONNA HAVE TO INCREASE THE BLOCK SIZE” "HOW THEY ACTUALLY DEAL WITH IT IS CURRENTLY UNKNOWN" 👀

The Bitcoin Historian

43,924 Aufrufe • vor 12 Tagen

THE FORMULA BEHIND EVERY BAYESIAN TRADE ON POLYMARKET - FREE STANFORD LECTURE Stanford teaches Bayes' Theorem in a free 1-hour lecture this is the exact math behind the 5 formulas in that article save this 👇
1:14:36

THE FORMULA BEHIND EVERY BAYESIAN TRADE ON POLYMARKET - FREE STANFORD LECTURE Stanford teaches Bayes' Theorem in a free 1-hour lecture this is the exact math behind the 5 formulas in that article save this 👇

Mr. Buzzoni

104,606 Aufrufe • vor 5 Monaten

I'm not a flat earther but The size of Australia in the recent picture of Earth from the Artemis to rocket does not match the Google maps ball which does fit all the continents and is very accurate when it comes to proportion.
1:00

I'm not a flat earther but The size of Australia in the recent picture of Earth from the Artemis to rocket does not match the Google maps ball which does fit all the continents and is very accurate when it comes to proportion.

Matt Baker

417,829 Aufrufe • vor 5 Monaten

It does not matter how successful you are, there is alwas somthing to fix in the bathroom!
1:59

It does not matter how successful you are, there is alwas somthing to fix in the bathroom!

Kevin O'Leary aka Mr. Wonderful

127,409 Aufrufe • vor 3 Monaten

CSS Trick! 🎃 You can create a wavey border for elements by layering masks 🎭 Used to create this ghost! 👻 Check the video for an exploding view 🫶 .👻 { --size: 20px; mask: radial-gradient(var(--size) at bottom, transparent 97%, #000), radial-gradient(var(--size) at 25% 50%, #000 97%, transparent); mask-repeat: repeat-x; mask-size: calc(2 * var(--size)) 100%, calc(4 * var(--size)) calc(2 * var(--size)); mask-position: 50% calc(100% - var(--size)), calc(50% - var(--size)) 99%; } That code looks kinda scary! 👻 This is one way you could do things. Check the video again or explode in the demo. One mask cuts out circles from the bottom of the element. The other adds overlaid circles back. And that overlap creates the wavey line you want for the ghost 🤙 Using a custom property you can write once and not have to touch again. Update the custom property to update the wave size as shown in the video 🎬 The last piece of the puzzle is animating the mask-position to create that animation @ keyframes flow { to { mask-position: calc(50% + (var(--size) * 4)) calc(100% - var(--size)), calc((50% - var(--size)) + (var(--size) * 4)) 99%; } } If you play with the demo, you may find some Easter eggs! Shake the ghost and double-tap it 😉 Happy Halloween! 🎃 CodePen.IO link below! 👇
0:36

CSS Trick! 🎃 You can create a wavey border for elements by layering masks 🎭 Used to create this ghost! 👻 Check the video for an exploding view 🫶 .👻 { --size: 20px; mask: radial-gradient(var(--size) at bottom, transparent 97%, #000), radial-gradient(var(--size) at 25% 50%, #000 97%, transparent); mask-repeat: repeat-x; mask-size: calc(2 * var(--size)) 100%, calc(4 * var(--size)) calc(2 * var(--size)); mask-position: 50% calc(100% - var(--size)), calc(50% - var(--size)) 99%; } That code looks kinda scary! 👻 This is one way you could do things. Check the video again or explode in the demo. One mask cuts out circles from the bottom of the element. The other adds overlaid circles back. And that overlap creates the wavey line you want for the ghost 🤙 Using a custom property you can write once and not have to touch again. Update the custom property to update the wave size as shown in the video 🎬 The last piece of the puzzle is animating the mask-position to create that animation @ keyframes flow { to { mask-position: calc(50% + (var(--size) * 4)) calc(100% - var(--size)), calc((50% - var(--size)) + (var(--size) * 4)) 99%; } } If you play with the demo, you may find some Easter eggs! Shake the ghost and double-tap it 😉 Happy Halloween! 🎃 CodePen.IO link below! 👇

jhey ʕ•ᴥ•ʔ

181,528 Aufrufe • vor 2 Jahren

If you're down 5-10% from your highs and still putting on full-size longs, your math is working against the market. That's not a test position, that's insanity. Four losses in a row is the market telling you something. You have no right to go full size there. Cut to an eighth, a sixteenth, and see if the water's warm enough to swim.
1:05

If you're down 5-10% from your highs and still putting on full-size longs, your math is working against the market. That's not a test position, that's insanity. Four losses in a row is the market telling you something. You have no right to go full size there. Cut to an eighth, a sixteenth, and see if the water's warm enough to swim.

Ameet Rai

15,910 Aufrufe • vor 29 Tagen

The new Mac mini is here. Small in size. Big on performance. From everyday productivity to all things AI, it can help you do it all.
0:37

The new Mac mini is here. Small in size. Big on performance. From everyday productivity to all things AI, it can help you do it all.

Tim Cook

11,326,218 Aufrufe • vor 16 Tagen

CSS Trick! 🤙 You can create gradient borders on translucent elements using mask-clip and mask-composite with a pseudo-element 🔥 .gradient-border::after { mask-clip: padding-box, border-box; mask-composite: intersect; mask: linear-gradient(transparent, transparent), linear-gradient(white, white); } It's the same "Transparent border trick" from before. But, now you apply it to a pseudo-element 😎 The trick is to create a pseudo-element with a gradient background and then mask it so we only see the part we want, the border ✨ mask-clip defines the area affected by a mask. Similar to how you can define background-size. Using padding-box and border-box constrains the two masks. mask-composite is the magic part ✨ It defines a compositing operation for stacked mask layers. Using intersect means that the parts that overlap get replaced. And this seems to work in all browsers 🙌 As for the rest of the styles... – Make sure you set pointer-events: none on the pseudo-element – Make sure it fills the parent element. You can use position: absolute and inset: 0 – Make sure the background fills the space including the border-width. You can use calc to achieve that: --bg-size: calc(100% + (2px * var(--border))); background: var(--gradient) center center / var(--bg-size) var(--bg-size); That's it! 🚀 Gradient borders on translucent elements. You can set all the backdrop-filter: blur() you like! 😅 CodePen.IO link below! 👇
0:37

CSS Trick! 🤙 You can create gradient borders on translucent elements using mask-clip and mask-composite with a pseudo-element 🔥 .gradient-border::after { mask-clip: padding-box, border-box; mask-composite: intersect; mask: linear-gradient(transparent, transparent), linear-gradient(white, white); } It's the same "Transparent border trick" from before. But, now you apply it to a pseudo-element 😎 The trick is to create a pseudo-element with a gradient background and then mask it so we only see the part we want, the border ✨ mask-clip defines the area affected by a mask. Similar to how you can define background-size. Using padding-box and border-box constrains the two masks. mask-composite is the magic part ✨ It defines a compositing operation for stacked mask layers. Using intersect means that the parts that overlap get replaced. And this seems to work in all browsers 🙌 As for the rest of the styles... – Make sure you set pointer-events: none on the pseudo-element – Make sure it fills the parent element. You can use position: absolute and inset: 0 – Make sure the background fills the space including the border-width. You can use calc to achieve that: --bg-size: calc(100% + (2px * var(--border))); background: var(--gradient) center center / var(--bg-size) var(--bg-size); That's it! 🚀 Gradient borders on translucent elements. You can set all the backdrop-filter: blur() you like! 😅 CodePen.IO link below! 👇

jhey ʕ•ᴥ•ʔ

269,847 Aufrufe • vor 2 Jahren

If you read "The Call of Cthulhu" carefully, and do some research, it's possible to work out the size of the creature encountered by the Emma's crew. The narrator says it's "Cthulhu" but we don't know this for sure. It might have "just" been a starspawn. I've done the math for you in the video below. Cutting to the chase, it turns out that Cthulhu is an exceedingly convenient size for tabletop roleplayers. He is, in fact, the same size with respect to humans that the average gamemaster is with respect to 28mm figures. You can scoop up your players' minis in your green flabby claw and say, "This is Cthulhu's size to you puny mortals. Roll for initiative." Cthulhu doesn't even need to regenerate to shrug off their tiny swords and arrows. A mighty wizard's lightning bolt is like a carpet spark. And if that size isn't enough for you, just take it for granted that the monster in the story wasn't Cthulhu, and the real deal is even bigger. Or you can assume Cthulhu has shrunk during the past 12,000 years (the last time he was out and about, causing the Pleistocene extinction) but will soon bulk larger.
0:59

If you read "The Call of Cthulhu" carefully, and do some research, it's possible to work out the size of the creature encountered by the Emma's crew. The narrator says it's "Cthulhu" but we don't know this for sure. It might have "just" been a starspawn. I've done the math for you in the video below. Cutting to the chase, it turns out that Cthulhu is an exceedingly convenient size for tabletop roleplayers. He is, in fact, the same size with respect to humans that the average gamemaster is with respect to 28mm figures. You can scoop up your players' minis in your green flabby claw and say, "This is Cthulhu's size to you puny mortals. Roll for initiative." Cthulhu doesn't even need to regenerate to shrug off their tiny swords and arrows. A mighty wizard's lightning bolt is like a carpet spark. And if that size isn't enough for you, just take it for granted that the monster in the story wasn't Cthulhu, and the real deal is even bigger. Or you can assume Cthulhu has shrunk during the past 12,000 years (the last time he was out and about, causing the Pleistocene extinction) but will soon bulk larger.

Sandy Petersen 🪔

21,417 Aufrufe • vor 9 Monaten

One of the easiest tricks to make something from high Street look a little more expensive is to buy it a size up. Give yourself the gift of having enough fabric to alter it so it fits you like couture!
0:59

One of the easiest tricks to make something from high Street look a little more expensive is to buy it a size up. Give yourself the gift of having enough fabric to alter it so it fits you like couture!

Carla Rockmore

1,349,059 Aufrufe • vor 2 Jahren

Donald Trump is the champion of feigning stupidity. How in the fuck does he not know what the rules and the regulations are? Trump’s Arlington excuse is weak AF. Maybe his brain really has atrophied to the size of a golf ball? #TrumpDishonorsUS
0:37

Donald Trump is the champion of feigning stupidity. How in the fuck does he not know what the rules and the regulations are? Trump’s Arlington excuse is weak AF. Maybe his brain really has atrophied to the size of a golf ball? #TrumpDishonorsUS

Luke

270,408 Aufrufe • vor 2 Jahren

Jensen Huang, CEO of NVIDIA, laid out the compute math almost nobody priced in: reasoning AI needs 1,000x more compute than generative AI. Then you multiply by 100x more users. "In order for AI to go through understanding, reasoning, planning, using tools to take action, the amount of computation necessary compared to generative AI is like a thousand times more." "In two years time, the number of cars you need in the world grew by a thousand times. In two years time, the number of airplanes you need in the world grew by 2,000 times. Whatever metric you want to use, the thousand times difference is incredible." "But then you multiply that by the number of people who now want to use it by a hundred times. Which is the reason why GPU consumption is going through the roof." "Even GPUs we sold 4 or 5 years ago are now rising in price faster than good wine. It has defied what everybody said was going to happen." The reasoning era did not make intelligence cheaper to run. It made a single answer cost 1,000x more compute, then handed that answer to 100x more people. Anyone still budgeting AI around "inference gets cheap" is planning for a curve that already snapped.
0:58

Jensen Huang, CEO of NVIDIA, laid out the compute math almost nobody priced in: reasoning AI needs 1,000x more compute than generative AI. Then you multiply by 100x more users. "In order for AI to go through understanding, reasoning, planning, using tools to take action, the amount of computation necessary compared to generative AI is like a thousand times more." "In two years time, the number of cars you need in the world grew by a thousand times. In two years time, the number of airplanes you need in the world grew by 2,000 times. Whatever metric you want to use, the thousand times difference is incredible." "But then you multiply that by the number of people who now want to use it by a hundred times. Which is the reason why GPU consumption is going through the roof." "Even GPUs we sold 4 or 5 years ago are now rising in price faster than good wine. It has defied what everybody said was going to happen." The reasoning era did not make intelligence cheaper to run. It made a single answer cost 1,000x more compute, then handed that answer to 100x more people. Anyone still budgeting AI around "inference gets cheap" is planning for a curve that already snapped.

Karl Mehta

54,717 Aufrufe • vor 2 Monaten

Reed explains that the job of a board member is not to add value or give advice. It is to replace the CEO: "If the company falls apart, I will be part of replacing the CEO. That's basically the entire job. To have the confidence to do that, you have to learn the business. Board members are not here to add value. They can hire consultants who know the industry and are not conflicted for advice. So I shouldn't spend my time trying to give advice. So then what am I doing? I'm here as a board member as an insurance layer. Don't measure yourself by did you give a suggestion? Measure yourself by did you get more prepared for the small chance that you will have to take big action."
2:02

Reed explains that the job of a board member is not to add value or give advice. It is to replace the CEO: "If the company falls apart, I will be part of replacing the CEO. That's basically the entire job. To have the confidence to do that, you have to learn the business. Board members are not here to add value. They can hire consultants who know the industry and are not conflicted for advice. So I shouldn't spend my time trying to give advice. So then what am I doing? I'm here as a board member as an insurance layer. Don't measure yourself by did you give a suggestion? Measure yourself by did you get more prepared for the small chance that you will have to take big action."

Patrick OShaughnessy

353,268 Aufrufe • vor 8 Monaten

The director and cast of ‘UNDERTONE’ tell us whether or not you should believe in ghosts. “The term paranormal is not a negative term, it’s actually positive... but if you choose to perceive it as scary, then you’ll scare yourself.”
0:57

The director and cast of ‘UNDERTONE’ tell us whether or not you should believe in ghosts. “The term paranormal is not a negative term, it’s actually positive... but if you choose to perceive it as scary, then you’ll scare yourself.”

DiscussingFilm

390,237 Aufrufe • vor 6 Monaten