Introduction to Variables

What is the primary function of a variable in programming?

• To perform complex mathematical operations

• To store and update values as the program runs

• To display messages to the user

• To control the flow of the program

How do you correctly declare a variable to track the number of lives in a game?

• var LIVES = 3;

• VAR lives = 3;

• LIVES var = 3;

• 3 = VAR lives;

What is a common mistake when referring to variables?

• Using the variable's label each time without 'VAR'

• Forgetting to assign a value

• Using 'VAR' every time the variable is mentioned

• Mixing up the order of label and value

Why is it important to choose meaningful labels for variables?

• To make the code run faster

• To make the code easier to understand and maintain

• To reduce the amount of memory used

• To impress other programmers

What does 'initializing a variable' mean?

• Deleting a variable from memory

• Creating a variable and assigning it a value simultaneously

• Assigning a new value to an existing variable

• Creating a variable without assigning any value

What does the assignment operator do in programming?

• Compares two values for equality

• Assigns a specified value to a variable

• Adds values together

• Creates a new variable

How is the assignment operator represented in some programming languages to avoid confusion?

• With a question mark (?)

• With a sideways arrow (→)

• With an asterisk (*)

• With a plus sign (+)

In programming, what is the difference between the equal sign used in mathematics and in coding?

• There is no difference

• In coding, it is used to compare values

• In coding, it represents the assignment operator

• In mathematics, it is used to assign values

What is the correct way to display the value of a variable named 'score'?

• display.score();

• console.log(score);

• console.log('score');

• write(score);

What happens if you try to display a variable that hasn't been declared?

• The program displays '0'

• The program gives an error

• The program continues without any issues

• The program displays 'null'