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Computer Science The major difference between the data together to achieve the overall goal of
abstraction and process abstraction is
abstraction in OOP. Data abstraction
that data abstraction hides details about
ensures that data is accessed and modified
data storage and manipulation, while
in a controlled manner, while process
process abstraction hides details about
abstraction ensures that functionalities
FOR ONLINE READING ONLY
how actions are implemented. For
example, data abstraction is like hiding are invoked and executed appropriately.
the wires and internal components of a
piano while providing knobs and buttons Exercise 4.5
for users. Process abstraction as shown 1. Imagine a class called
in Figure 4.9 is like pressing a “play” “BankAccount”. Suggest the
button on the piano without needing to attributes that are expected for this
know the mechanics of how the music class.
is played. 2. Describe how a principle of OOP
would assist you in restricting direct
Private access to the balance in your Bank
fill_fuel() Account so that someone may not
create_spark() change your account balance.
move_break_pads()
change_piston_speed() 3. Recommend the methods to be
used in the class “BankAccount”
Public in order to control how the
turn_on() balance is accessed and modified,
turn_off() potentially adding security checks
Car driver break() or validations.
gear_change()
Instead, the class would provide
methods like deposit() and
Car
withdraw(). These methods would
Figure 4.9: Process abstraction control how the balance is accessed
and modified, potentially adding
The relationship between data abstraction security checks or validations.
and process abstraction is that both work

Difference between OOP and Procedure Oriented Programming
(POP)
There are several differences between these two types of programming. Table 4.1
shows the differences between them.

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Computer Science Form 5.indd 222 23/07/2024 12:33