Variables and data types notes

What is a variable?

A variable is a named storage location in memory that holds a value. Its value can change during program execution.

True or false: Variables can only hold one type of data.

False, because variables can hold different types of data depending on how they are defined.

Define 'data type'.

A data type defines the kind of data a variable can hold, such as integers, strings, or booleans.

What is an integer?

An integer is a whole number, positive or negative, without decimals. Examples include -3, 0, and 42.

Difference between 'float' and 'integer'.

A float is a data type for numbers with decimals (e.g., 3.14), while an integer is a whole number (e.g., 2).

Fill in the blank: A ___ holds a sequence of characters.

String – A string is used to represent text in programming.

What does 'boolean' data type represent?

A boolean represents one of two values: true or false. It's often used for conditional statements.

True or false: Strings can contain numbers.

True, because strings can include any characters, including digits, as part of their content.

What is a constant?

A constant is a variable whose value cannot be changed once it is set. It remains the same throughout the program.

Question: What is a list?

A list is a data structure that holds an ordered collection of items, which can be of different data types.

What is the purpose of a variable?

Variables are used to store data that can be referenced and manipulated throughout a program.

Fill in the blank: The data type __________ is ideal for true/false values.

boolean – This data type is used specifically for representing truth values.

Comparison: Local variable vs Global variable.

A local variable is defined within a function and accessible only there, while a global variable is accessible throughout the program.