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Computer Science IGCSEPDF 99
142 pagesrevision 46930
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8.1 General Guidelines for Pseudocode
Declaration
Variable
CONSTANT Pi = 3.142
Constant
DECLARE amount : INTEGER
Variables:
An identifier whose value can change during the execution of a program.
Declaration
Assignment
DECLARE <identifier> : <data_type>
<identifier> ← <value>
Constants:
An identifier whose value cannot change during the execution of a program.
Declaration
CONSTANT <identifier> = <value>
Describe how variables and constants are used in programming.
variables / constants are used to store items of data
• the data stored in variables / constants are accessed by an identifier // named data
stores
• the value of a variable may change during the execution of a program
• the value of a constant will remain the same during the execution of a program
Array:
Array is a linear data structure where all elements are arranged sequentially. It is a
collection of elements of same data type stored at contiguous memory locations.
CONSTANT <identifier> = <value>