Comp 1 2014 Discussion

The possibility question at the end pulled me down

For anyone who did do the possibility question did you get 47 % and then 43% of it being higher?

For anyone who did do the possibility question did you get 47 % and then 43% of it being higher?

I got 0.9something something, then I got 0.9. It didn't ask for percentages?

I got 0.9...something and then 0.88. I was using Python, so I'm not sure how rounding works in other languages. I know I got floating-point values.
As for percentages, I think that might be acceptable, as long as you made it clear that's what they were - if you didn't add the percentage sign, you're definitely screwed.

I didn't round, however I reproduced my solution just now with a correction, and the probabilities should be : Press 2 --> Probability 1 --> Press y --> Probability 0.9 something --> Press y --> Probability 0.88.

Agree with the percentage sign thing. Depends on how moody the examiners are feeling.

Phew, I'm feeling pretty confident about that then. I think the programming went well, even though I was kind of pissing myself about it - in class we did a few of the possible questions and one of them stumped me. I feel so lucky it didn't come up.

Yeah programming is generally no problem for me, I just have to watch out for silly mistakes and focus a bit more on the theory.

That's the thing you see - usually I'll program away, no problem. But in that lesson, suddenly I couldn't do it that well! I was so worried. It must just have been a bad day or something, I suppose. I think I avoided silly mistakes this time around
Didn't do perfectly on the theory though haha. Loved that Gray code algorithm though, that was so bizarre.

Yep the Gray code algorithm looked completely random, I seriously wonder how they got that to produce Gray code. I think I made a silly mistake in the last question because my probabilities were wrong as I may have included one extra card in the number of cards left Still did everything else fine.

What did you put for the problem with the linear search algorithm?

Yep the Gray code algorithm looked completely random, I seriously wonder how they got that to produce Gray code.

Ah, the mysteries of computing
What probabilities did you get? Mine were 0.9something and 0.88. I was confused for a bit because both came out as 0 at first, but then I remembered Python is just weird like that. Close call though.

I can't remember that question, what was it?

About the probability question, the first card was the Ace of Clubs and the second was the Two of Hearts. The suit order in the previous "IsNextCardHigher()" function was:
Clubs, Diamonds, Hearts, Spades
from lowest to highest.
Therefore the Ace of Clubs is the lowest possible card and thus the probability of the next card being higher is definitely 100%.
The Two of Hearts has 11 ranks above it (Three to King), each with 4 suits. In addition, the Two of Spades is higher than the Two of Hearts, so 11*4 + 1 cards are higher than the Two of Hearts out of the 50 remaining (since the Ace of Clubs is removed from the deck).
Therefore the second probability is:
(11 * 4 + 1) / 50 * 100 = 90% exactly.

If I'm wrong somewhere, feel free to point it out, but that was what I got. (P.S. I'm surprised so many people did the exam in VB.net or Pascal as opposed to Python. I have a weird affinity for Python for some reason.)

Ah, the mysteries of computing
What probabilities did you get? Mine were 0.9something and 0.88. I was confused for a bit because both came out as 0 at first, but then I remembered Python is just weird like that. Close call though.

I can't remember that question, what was it?