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# National 5 Computing Science

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1. (Original post by Ethan100)
Can anyone tell me all I need to know about the processor for National 5
just the buses and possibly about the ALU. How's everyone doing? i have modern studies on monday i can't be arsed with computing hahhaha
2. (Original post by Ethan100)
Can anyone tell me all I need to know about the processor for National 5
The processor has 3 parts

Control unit - Manages the executions
ALU - Does all the arithmetical operations
Registers - Stores data temporary
3. (Original post by Ethan100)
Thanks Ross
No problem! Good luck in your exam tomorrow.

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4. (Original post by Ethan100)
Ross, do you know that negative decimal to binary thing? I think it's called Two's Compliment. Do you think one will come up because it's always been a positive decimal number to binary question in the past.
2's Compliment is introduced at Higher Ethan. N5 only deals with positive integers.

Good luck tomorrow guys.
5. (Original post by PTS_99)
2's Compliment is introduced at Higher Ethan. N5 only deals with positive integers.

Good luck tomorrow guys.
Really ? Why the hell did our teacher teach us it haha

Thanks dude, good luck to you too
6. Can anyone bring a copy of the section A and B?
7. (Original post by Ethan100)
Really ? Why the hell did our teacher teach us it haha

Thanks dude, good luck to you too
No idea, seems odd.

Thanks.
8. What's the difference between a compiler and interpreter??
9. (Original post by Lewis H01)
Could someone give me a description of what an array is and string?

This may look silly, but how do you identify which is which in a programming code?
Basically if u see a question which asks you to name the data structure, it will always be an array because that's the only data structure we are taught at N5!!

But one thing to always remember is that those questions are normally worth 2 marks so to get both you need to say : "array of strings" or "array of reals" etc.
10. (Original post by A+Hunter)
What's the difference between a compiler and interpreter??
Interpreter:
- Each line of the program must be translated before it can be run (therefore program loads slower)
- Requires more RAM
- Errors can be quickly identified

Compiler:
- Translates the whole program at once into machine code
- Once translated the machine code is saved therefore can be run over and over again
- Program runs much faster as no translation is done at execution time
- The program will not run at all until the program is completely free of syntax errors
11. (Original post by alx2000)
Interpreter:
- Each line of the program must be translated before it can be run (therefore program loads slower)
- Requires more RAM
- Errors can be quickly identified

Compiler:
- Translates the whole program at once into machine code
- Once translated the machine code is saved therefore can be run over and over again
- Program runs much faster as no translation is done at execution time
- The program will not run at all until the program is completely free of syntax errors
Cheers, this will help
12. Can anyone bring a copy of the paper please?
13. (Original post by alx2000)
Basically if u see a question which asks you to name the data structure, it will always be an array because that's the only data structure we are taught at N5!!

But one thing to always remember is that those questions are normally worth 2 marks so to get both you need to say : "array of strings" or "array of reals" etc.
Whats an array or reals ?

Real Numbers ? does the include decimal numbers
14. (Original post by Ethan100)
Can anyone tell me all I need to know about the processor for National 5
How I remember the answers to these sorts of questions :

- if you see the word "location" in the question you are automatically thinking of the address bus
- if you see the word "transfer" in the question you are automatically thinking of the data bus
- if you see the word "calculation" or "comparison" in the question you are automatically thinking of the ALU

hope that helps you!
15. (Original post by Ethan100)
Whats an array or reals ?

Real Numbers ? does the include decimal numbers
Real numbers are non whole numbers and yeah they are decimals..
16. (Original post by Ethan100)
Whats an array or reals ?

Real Numbers ? does the include decimal numbers
Yes, a real number is a number which has a decimal part.

An integer is a whole number and so of course you could also have an "array of integers".

One example would be (taken from 2015 paper):

State the data structure that would be required to store the list of totalPrice values.

17. (Original post by alx2000)
How I remember the answers to these sorts of questions :

- if you see the word "location" in the question you are automatically thinking of the address bus
- if you see the word "transfer" in the question you are automatically thinking of the data bus
- if you see the word "calculation" or "comparison" in the question you are automatically thinking of the ALU

hope that helps you!
(Original post by Lewis H01)
Real numbers are non whole numbers and yeah they are decimals..

Thank you so much !

Do any of you know what Carbon footprint is ?
18. (Original post by Lewis H01)
Can anyone bring a copy of the paper please?

(Original post by Ethan100)
Thank you so much !

Do any of you know what Carbon footprint is ?
It's the amount of greenhouse gases used by each person.
19. (Original post by Lewis H01)

It's the amount of greenhouse gases used by each person.
Yeah but what's that got to do with computing ?

Sorry I won't be able to, I think only teachers get the papers because we will be writing in ours
20. Does anyone think that there might be a question on normalisation?

Perhaps when you are given a table and you have to show the process.

I personally would really like this to come up however I'm not sure if that is expected at N5 level.

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