Hayden Nicholls
Symbol
Meaning
::=
Is Defined As
< >
Non-Terminal Symbol (e.g. )
|
or
Terminal Symbol (e.g. a (only))
Symbol
Meaning
=
Is Defined As
Non-Terminal Symbol
|
Or
“ ”
Terminal Symbol (e.g. “a” (only)
[ ]
Optional
{ }
and/or , Optional Repetition
( )
Grouping
EBNF
BNF
digit = “0”|”1”|”2”|”3”|”4”|”5”|”6”|”7”|”8”|”9”letter =
“A”|”B|”C”|”D”|”E”|”F”integer = digit{digit}
word = letter{letter}address = word integer
::= 0|1|2|3|4|5|6|7|8|9 ::= A | B | C | D | E | F ::= |
::= | ::=
Railroad Diagram
Data Type
Description
Examples
Integer
Whole number
-50, 0, 23
Floating Point Integer
Used to Store Fractions and Very Large Numbers
-1.23 * 10⁻⁶⁸, 2.3 * 10⁴⁵
Boolean
On/Off, True/False
True, False
String
Stores Text Data, Combination of Character
“abc123”, “Once Upon a Time”
Desk Check Example
A Desk Check records the state and output of each variable in
each count of a program
1
2
3
4
5
Frog
Cow
Dog
Cat
Bird
Data Type/Category
Entry
Name
Hayden Nicholls
City
Sydney
Postcode
3405
Country
Australia
Data Item
Data Type
Description
Example
Speed
Integer
Determines the speed of X, Y movement
6
Left Key Pressed
Boolean
Determines if the Left Key is pressed
True
Player Name
String
The printed name of the character
“CoolGuy98”
Activation Date
Date
The date the game was first installed
23/8/2013
BEGIN LAMP
IF (lamp doesn’t work)
IF (lamp not plugged in)
THEN plug in lamp
ELSIF (bulb burned out)
THEN (replace bulb)
ELSIF (still not working)
THEN repair
END LAMP
Algorithms
Flowchart
Pseudocode
Data Dictionary for RPG Game
Sequential files can only be read from start to finish, they are
continuous stream of data (e.g. tracks on a cassette tape, text
file for a jpeg). Sequential data storing.
Data is related but not necessarily the same type, such as in a
database
Record ‘Individual Profile’
Animals (1) = ‘Frog’Animals (4) = ‘Cat’
Animals (2) = ‘Cow’Animals (5) = ‘Bird’
Animals (3) = ‘Dog’
One Dimensional Array ‘Animals’
A Context Diagram is the most basic Data Flow Diagram
Data Flow Diagram
Flow Chart
Structure Charts
