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GCSE Computing > Autumn Term 2 Mr Reid > Flashcards

Autumn Term 2 Mr Reid Flashcards

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1
Q

what is iterative testing?

A

testing the code as it’s created, altering as required

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2
Q

what are the three types of error?

A

logic,runtime,syntax

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3
Q

what do logic errors do?

A

programs operate incorrectly-not crash- so unintended results

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4
Q

what are runtime errors?

A

an error that causes the program to crash even if there’s nothing wrong with the code, only detected when the program is run, eg run out of memory, infinite recursion

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5
Q

what is casting?

A

change a var’s data type

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6
Q

what is initialising?

A

giving a var a value when you create it

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7
Q

what is assignment?

A

changing a var’s value

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8
Q

what is a transcription/transposition error?

A

errors in transferring data onto computer

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9
Q

how can data entry errors occur?

A

transcription/transposition
source doc errors

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10
Q

what is verification (not passwords)

A

checking data to make sure its been transferred correctly

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11
Q

list some verification methods

A

double entry like password entry
proofreading

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12
Q

what can incorrect data lead to?

A

loss of income, reputation; legal ramifications; incorrect processing

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13
Q

why is it important to check data?

A

so data is as accurate as possible

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14
Q

are strings primitive data types

A

yes

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15
Q

can verification detect source doc errors?

A

no

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16
Q

can validaiton detect source doc errors?

A

yes

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17
Q

how is validation different to verification?

A

process to make data is sensible and valid, can be done by computer on input. used to check data against rules. can find source doc errors

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18
Q

list 5 types of validation

A

length check: is the data the expected length?
range check: is the data a sensible amount?
lookup check: does the data exist somewhere else? eg. a title like mr, ms, prof, etc.
format check: eg is it dd/mm/yy
presence check: is it there?

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19
Q

list characteristics of a low level language (5)

A

machine code+assembly language
tricky to program as programmer must do the logic reasoning
v. fast
produces small, efficient programs
often used in integrated systems

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20
Q

list high level language characteristics

A

easier to understand/write
can make big, sophisticated programs more easily.
englishish words.
platform dependant

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21
Q

what are characteristics of assembly code?

A

low-level,uses mnemonics,has an opcode and operand,has a 1-1 relationship with binary

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22
Q

what do assemblers do?

A

translate assembly code into machine code, platform dependant

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23
Q

does assembly code have a 1:1 relationship with machine code

A

yes

24
Q

what do you use to translate assembly code into machine code?

A

an assembler

25
Q

what does the SQL command SELECT do?

A

chooses data

26
Q

what does the SQL command FROM do?

A

determines the table to grab data from

27
Q

what does the SQL command INSERT do?

A

places new data into the table

28
Q

what does the SQL command UPDATE do?

A

changes existing data

29
Q

what does the SQL command DROP do?

A

gets rid of existing data

30
Q

what does the SQL command DELETE do?

A

gets rid of existing data

31
Q

what does the SQL command WHERE do?

A

criteria to meet

32
Q

what does the SQL command OR do?

A

widens search criteria

33
Q

what does the SQL command AND do?

A

narrows search criteria

34
Q

what does the SQL command LIKE do?

A

similar to this

35
Q

what language translator is needed for the first generation?

A

no translator

36
Q

what sort of relationship do low-level to high level languages have?

A

one to many- for every high level instruction there are many low level instructions

37
Q

what is the easiest generation to code in?

A

3rd gen

38
Q

which generation would create the fastest code?

A

1st generation

39
Q

what is meant by source code?

A

the code written by the programmer

40
Q

what is used to translate assembly code?

A

assemblers

41
Q
A
42
Q

which gen of a programming language uses machine code?

A

1st gen

43
Q

what language translator is used at the end of development?

A

compiler

44
Q

which language translator produces object code and an error report?

A

compiler

45
Q

which language translator is used with the second gen?

A

assembler

46
Q

which language translator is used with the 3rd gen?

A

compiler

47
Q

which language does not convert source code into machine code?

A

interpreter

48
Q

which translator stops when it encounters an error?

A

interpreter

49
Q

what features can an IDE include?

A

pretty text, predictive text, debugging tools including variable inspection, break point, step through

50
Q

what does IDE stand for?

A

Integrated Development Environment

51
Q

how are interpreters different from compilers?

A

they translate line by line and stop when they reach an error. slower than compiled problems

52
Q

what is the opcode?

A

the instruction, eg ADD, SUB

53
Q

what is the operand?

A

the data/value being acted on by the operand

54
Q

how does the computer know whether a number is an instruction or value?

A

whether it is LDA (ing) or STA (ing) the number first

55
Q

what do LDA and STA stand for in LMC?

A

Load and Store

56
Q

what do BRZ and BRA stand for in LMC?

A

Branch when Zero and Branch Always

GCSE Computing (14 decks)

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