spec niche

different types of iteration

• condition controlled

• count controlled

boolean values

true, false

boolean operators

AND, NOT, OR

==

equal to

!=

not equal to

<

less than

<=

less than or equal to

>

greater than

>=

greater than or equal to

what are == != <> examples of?

comparison operators

what are +-/* examples of?

arithmetic operators

+

addition

-

subtraction

*

multiplication

/

division

MOD %

modulo

DIV //

quotient

^

exponentation

defensive design considerations (4)

• anticipating misuse

• authentication

• validation

• maintainability

define syntax error

problem with the grammatical rules of the programming language which stop it from being run

define normal test data

data which should be accepted by a program without causing errors

define boundary test data

data of the correct data type on the edge of being valid

define invalid test data

data of the correct data type which should be rejected

define erroneous test data

data of the incorrect data type which should be rejected

and gate symbol

or gate symbol

not gate symbol

proper name and gate

conjunction

proper name or gate

disjunction

proper name not gate

negation

what is the purpose of translators?

code written in high-level source code is converted into machine code for execution

how is assembly language translated into machine code

assembler

ocr reference language comment

//

for i = 2 to 10 step 2
	print(i)
next i

what does this ocr reference language do?

prints even numbers between 2 and 10

is ocr reference language exclusive or inclusive

inclusive

is python exclusive or inclusive

exclusive

for i = 10 to 0 step -1
       print(i)
next i

what does this ocr reference code do?

prints numbers in descending order from 10 to 0

difference between while loop and do until loop

• while loop checks condition before first loop carried out

• do until does one loop and then checks the condition

possible indexes array colours[5]

5 indexes, 0,1,2,3,4

what possible values does myVariable = random(1, 6) generate?

random integer between 1 and 6 inclusive

why do we test programs?

• to identify errors

• so we can fix them