Lecture 11: What to do when things go wrong? Richard Buckland UNSW

[flowewritharoma]

awesome lecture

[NiGhtMarEs0nWax]

also i noticed that he was referring to a 256 bit number as 1, 2, 4, 8, 16, ~ 256. when in reality its 1, 2, 4, 8, 16, ~ 128. 255 is the sum of all teh bits together + the 0 to make 256 unique combinations. when a byte is signed it ranges from -64 to +64, giving it still a possible of 256 combinations. is that correct?

i noticed that ona previous lecture aswell, maybe i am missing something :P

[TeckMod]

@NiGhtMarEs0nWax I know this is 2 years old,but let me explain as I understand it.Let's say we have 4 bits; that means that you can go from 0 to 15 (2^[# of bits]). Now notice that we have an even number of numbers we can represent in 4 bits.If we want to have signed numbers we half that quantity(half positive,half neg/),so now we go from 0 to 7 and from -0 to -7. There's a neg zero, so we take it out and use its place to store another negative number.

[NiGhtMarEs0nWax]

@TeckMod that doesn't make sense. the high order bit is reserved as a flag, when all the bits are off, zero can be + or - , although negative zero isn't used it's function cannot be given to another number. if that bit was set, how could that number be interpreted as a positive or negative value?

i was talking about the number range. its actually just (2^7)-1 for an 8 bit sequence; this gives a maxiumum. ((2^7)*2)-1 or (2^8)-1 [same thing] to find the total amount of true representable values.

[NiGhtMarEs0nWax]

why do youtube videos always stop and start as "loading" when im only 50% of twh ay through the buffer?

[0121ryanh117]

This video is only 80 MB. Good compression

[SauronsEye]

Going to Uni and the usual HECS/HELP fee at the end is a burden, that alone will prevents many attending Uni..

So thankyou to the Uni of NSW for these videos.

I'd probably never do this course for real and 2ndly the Uni is so far from my home for a daily commute but I still get to learn something that I will use.

So thank you again.

[kid29a]

I wonder if more advanced material can be that fun ;) for example: some java database web application programming. I just love the way wich this guy is teaching :)

[SilkSwe]

I wonder why they don't just use an screen capture program instead of filming.

[Pincus666]

Because then you couldn't film Richard or the room.

[Pincus666]

and blackboard etc

[SilkSwe]

Well of course, but instead of using that camera that they have so much problem with they could just have captured the screen. Then after some minor editing it would be exactly the same. :D

The other things they would of course film with a camera.

[Pincus666]

Not that I am disagreeing with you, but they probably don't want to do any editing.

[SilkSwe]

Could be. :)

Either way I'm just thankful to them for posting the videos at all.

[theLichKing1]

they have like 55 videos for only the Higher Programming course.. it would take an enormous amount of effort to edit videos and mix things together.. be thankful that they have those available for the world

[khalimseye]

that's a stupid question