A level paper 3

They allow for flexibility to suit specific need within a program

Represents a single value with no internal subcomponents Ex. INTEGER, BOOLEAN, REAL

Enumerated data types like

Type
Daysofweek = (Monday, tuesday, wednesday)

Pointer data type
pointer uses ^ it points to the adress where a variable is stored using @ you can derreference by using ^

Multiple components

TYPE (name)
(variable name): (DATA TYPE)
(variable name): (DATA TYPE)
ENDTYPE

Sets, unorderdered and without duplicates

one after the other in a linear order

Daily logs

marked as deleted without removing it

arranged sequentially in predefined order

Order management in eccomerce
needs to be copied into another file to delete

Any data can be retrieved at any time
Can be easily deleted by marking it available

Achieves direct access, reduce collision by using prime number close to the expected size. Produce seemingly random hashes

Dealing with collisions (Sequential search)(reserved adresses)(linked list accesible from each adress)

Mantissa value is maxed when 2 most relevant bits are different

set rules and conventions that allow for data exchange and communication