Computer Science Paper 2 OCR GCSE (9-1) Unofficial Mark scheme

for that i got 2,3,4
and the next one was 3*5 which was 15

What did everyone get for the 2nd question about the first 3 numbers output and how many times does line 3 repeat?

2 programming constructs were ITERATION and SEQUENCING

I did 'A OR (NOT B) for the logic one

B5 for hexadecimal

10000100 for the binary one

Sequence and Iteration

* for SQL Wild Card

One place left shift for doubling

M and K for variables (if I remember correctly)

ASCII in 7 bits, extended ASCII in 8 bits so it has more combinations for characters.

Alright, these are the questions I remember:
The SQL ones:
Data types: string / text, integer, boolean
SQL statement: SELECT StudentName FROM Conduct WHERE Points < 0
Wildcard: * (an asterik)

Algorithm:
If studentdata [3] == "TRUE" then
Print ("sent"
Else
Print ("not sent"
Endif

For the algorithm with the nested for loop:
First three outputted numbers: 2,3,4 (not sure about this)
Number of times line 3 repeats: 15
Define a variable: stores a data value under an identifier which links to a memory location. The value can change at any time whilst the programme is running
The two variables: could have been m,k or p

The library code question:
The parameter was "year"
The number in .subString () was 3
The next line is assigning it to any variable name (I named it "code"

The algorithm:
Title = input ("enter title"
Year = input ("enter year"
code = librarycode (title, year)
file = openWrite ("books.txt" - can't remember the file name
file.writeLine (code)
file.close ()

Difference between a function and a procedure:
Functions always return at least one value whereas parameters don't return a value.

Advantages of subprograms:
- useful when you need to repeat code in diferent places in a program
-more structure and readability
-cuts down on amount of code
(+explanation as 4 marks)

For the infinite loop question:
The first two were infinite the second two were not.

Algorithm to count to 10:
For k = 1 to 10
print k
next k

132 in binary: 10000100
Binary to hex : B5
To double number: left shift 1 place
That's what I remember

no mate . your wrong its stuff like if, for etc

M WAS NOT THE VARIABLE IT WAS THE CONSTANT
THE VARIABLE WAS P and K (i think)

Ahhh ****!!!!!!

My thoughts exactly

What did everyone get for the 2nd question about the first 3 numbers output and how many times does line 3 repeat?

2,3,4 as the nested 'for' loop has to run from k = 1 to 5 before p can become 2.

Originally I wrote 2,4 and 6, but realised the mistake and changed it.

Line 3 repeated 15 times, since the k ran from 1 to 5 for each p, which was from 1 to 3.

no mate . your wrong its stuff like if, for etc

Guys what was the symbols notation for logic gates i think i may have seen something different in my exam and got it wrong

I got pretty much exactly this, except for the library question, where I believe the last word should have been "return" instead of assigning a new variable, and I don't know if you can put 'm' as the variable for the nested loop question, as the mark scheme may be picky and claim it's a constant, because it isn't changed.
But otherwise agree with this

for that i got 2,3,4
and the next one was 3*5 which was 15

M WAS NOT THE VARIABLE IT WAS THE CONSTANT
THE VARIABLE WAS P and K (i think)

I got pretty much exactly this, except for the library question, where I believe the last word should have been "return" instead of assigning a new variable, and I don't know if you can put 'm' as the variable for the nested loop question, as the mark scheme may be picky and claim it's a constant, because it isn't changed.
But otherwise agree with this

Alright, these are the questions I remember:
The SQL ones:
Data types: string / text, integer, boolean
SQL statement: SELECT StudentName FROM Conduct WHERE Points < 0
Wildcard: * (an asterik)

Algorithm:
If studentdata [3] == "TRUE" then
Print ("sent")
Else
Print ("not sent")
Endif

For the algorithm with the nested for loop:
First three outputted numbers: 2,3,4 (not sure about this)
Number of times line 3 repeats: 15
Define a variable: stores a data value under an identifier which links to a memory location. The value can change at any time whilst the programme is running
The two variables: could have been m,k or p

The library code question:
The parameter was "year"
The number in .subString () was 3
The next line is assigning it to any variable name (I named it "code")

The algorithm:
Title = input ("enter title")
Year = input ("enter year")
code = librarycode (title, year)
file = openWrite ("books.txt") - can't remember the file name
file.writeLine (code)
file.close ()

Difference between a function and a procedure:
Functions always return at least one value whereas parameters don't return a value.

Advantages of subprograms:
- useful when you need to repeat code in diferent places in a program
-more structure and readability
-cuts down on amount of code
(+explanation as 4 marks)

For the infinite loop question:
The first two were infinite the second two were not.

Algorithm to count to 10:
For k = 1 to 10
print k
next k

132 in binary: 10000100
Binary to hex : B5
To double number: left shift 1 place
That's what I remember