Understanding Variables in Programming

What is the primary purpose of variables in programming?

• To define static values that never change

• To perform complex mathematical operations

• To control the flow of the program

• To store data that can change during program execution

Which keyword is used to declare a variable in JavaScript?

• const

• var

• int

• let

What type of values can variables store?

• Numbers, strings, or boolean values

• Only boolean values

• Functions only

• Only numbers and strings

What does it mean to initialize a variable?

• To update it with a new value

• To declare it without assigning any value

• To assign an initial value at the time of declaration

• To check its value during debugging

Which of the following is an example of updating a variable?

• var score;

• var score = 0;

• score = score + 1;

• score + 1;

Which of the following is a common error when working with variables?

• Using descriptive names

• Forgetting to initialize variables

• Adding too many comments

• Following consistent naming conventions

variable

• A graphic character on the screen with properties that describe its location, movement, and look.

• a series of images that create the illusion of motion by being shown rapidly one after the other

• a single image within an animation

• A placeholder for a piece of information that can change.

Based on the following code, what gets printed to the screen?

greeting = 7

name = "Bob"

greeting = "Hello"

print(greeting)

• 7
• <class 'int'>
• "Hello"
• <class 'str'>

True or False: In JavaScript variables are case sensitive

• True
• False

My_name = "Awesome"

My_name in this string is...

• a variable

• syntax

• my name

• prompt