Notes for B2.1.1 Constructing and Tracing Programs Using Global and Local Variables of Various Data Types - IB | RevisionDojo
B2.1.1 Constructing and Tracing Programs Using Global and Local Variables of Various Data Types Notes
Understanding Variables and Data Types
Variables are named storage locations in memory that hold data.
They are essential for writing programs, as they allow you to store, manipulate, and retrieve information.
Note
In Java, you must declare a variable's data type when creating it.
In Python, variables are dynamically typed, meaning the data type is inferred from the assigned value.
Primitive and Object Data Types
Primitive Data Types: Built-in types with no methods.
Boolean: Represents true or false.
Integer: Whole numbers.
Decimal: Numbers with a decimal point (e.g., float, double).
Char: A single character (Java only).
Object Data Types: Types with methods, like strings.
String: A sequence of characters.
Note
In Python, strings are considered primitive but have methods associated with them.
Global vs. Local Variables
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Note
Introduction to Variables
Variables are named storage locations in memory that hold data.
They are essential for writing programs, as they allow you to store, manipulate, and retrieve information.
DefinitionVariable
A named storage location in memory that holds data.
Example
Think of a variable like a labeled box where you can store different items. The label (variable name) tells you what's inside, and you can change the contents (value) as needed.
Note
In programming, variables must have unique names within their scope.
