WJEC A2 Computing CG3 - Tuesday 23rd June 2015 [Exam Discussion Thread]

Nice!
Computer Science at University of Bath

Making a MS now!

Yeah i thought it would be computer science! I hope you get what you need for that! and thank you, really appreciate it!

Aha I'm so predictable

Could you help me remember marks when I've posted it please?


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Help you remember marks? do you mean how many marks each question was worth, yeah i can give it a go

Yeah I'll give it a bash when I post it (it'll be in the first post) but I'm sure I'll be wrong on a few!


Posted from TSR Mobile

For the algorithm i got something like this (i know it is not very efficient) - did anyone else get anything like this? are there any problems with it? :

Set NumberOfStudents = 0
Set Max = 0
Set Min = 10
Set Total = 0
Set FinalMark = 0
Set HighestMark = 0
Set Mark(8) as an array

Input NumberOfStudents

For X = 1 to NumberOfStudents
For N = 1 to 8
Input Mark(N)
If MarkN > Max then
Max = MarkN
End If

If MarkN < Min then
Min = MarkN
End If
Total = Total + Mark(N)

End For

FinalMark = Total - (min + max)
If FinalMark > Highest Mark then
HighestMark = Final Mark
End If

Output = "Final Mark = " FinalMark

End For

Output "Highest Mark =" HighestMark

Can i ask why you set min to 10 and max to 0?, i agree with every other line except for that, i must have misinterpreted the question :/, i thought they said the mark has to be inbetween 0 and 10 which i assumed the meaning that max would be 10 and minimum would be zero?

Any idea how many marks i would lose for setting max to 10 and min to 0 but still writing every other line exactly the same?

Can i ask why you set min to 10 and max to 0?, i agree with every other line except for that, i must have misinterpreted the question :/, i thought they said the mark has to be inbetween 0 and 10 which i assumed the meaning that max would be 10 and minimum would be zero?

Any idea how many marks i would lose for setting max to 10 and min to 0 but still writing every other line exactly the same?

Told you someone else would explain it far better than me!

In theory you could set Min to anything over 10, i was originally going to set it to 999 out of habit but realised i didn't need too!

So that i could compare values

With Min being 10, if i say "if mark is lower than min (10) then make that the new min, sorry I'm awful at explaining!! someone else will explain it better than me I'm sure

I set those values too. It initialises them because when a mark is less than 10 it will be set to min and when a mark is greater than 0 it is set to max.

That means that given typical data, the initial variable value of 10 and 0 will always be overridden by other data.

If for example the max and min were both set to zero, then there would be no scores less than zero and hence the minimum would stay zero.

If for example the max and min were both set to ten, then there would be no scores greater than ten and hence the maximum would stay ten.

These initialisations are to ensure a new value replaces the initial value when data is entered for student scores.


Posted from TSR Mobile

Thank you both very much, thinking about it, i have always seen past paper questions set the min to stupidly ridiculous values but never understood the logic behind it until now, Thanks Guys. Also any idea how many marks i would have lost for that or am i asking a stupid question?

generally the algorithm marks are separated into different catorgies, for this one i imagine its
- initialising the variables/inputs
-having 2 nested for loops
-comparing values to find min
-comparing values to find max
- calculating the total - (min + max)
-out puts

so depending on how much you've done correctly, you may lose 1 or 2 marks for setting variables incorrectly i would say

generally the algorithm marks are separated into different catorgies, for this one i imagine its
- initialising the variables/inputs
-having 2 nested for loops
-comparing values to find min
-comparing values to find max
- calculating the total - (min + max)
-out puts

so depending on how much you've done correctly, you may lose 1 or 2 marks for setting variables incorrectly i would say

Does it matter the order the outputs go in?

I made it so that the total mark was output after each student had their 8 marks input (as opposed to after all marks had been input for each student) as I didn't use an array. Reckon this matters?


Posted from TSR Mobile

I don't think the location of the output matters, form what i remember in mark schemes I've seen outputs in the middle of code so, thats exactly what i did aswell so

While i remember, how did everyone find the "drawbacks of online shopping" question? it was 6 marks, but i only could think of 4 points, which i tried to expand on, how did everyone else approach this?

Nice!
Computer Science at University of Bath

Making a MS now!

I regurgitated the mark scheme from a few years back - it had a similar question but was more general - this was specific to the customer. I was just like:

• can't see/try on item
• can't get item immediately
• required credit/debit card
• website could be fraudulent - credit card details might be lost and item might not get delivered
• often a delivery charge
• have to go to the post office to collect the item
• item could be lost or damaged in the post




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