Variables

var x = 150

var y = 75

What is the value of the y variable?

• 150

• 75

• 225

• Infinity

In the following code, we define a variable and use it to draw a rectangle:

var rectWidth = 20;

rect(10, 10, rectWidth, rectWidth);

How wide is the rectangle?

• Not wide enough

• 10

• 20

• 30

In the following code, we define two variables, w and h, and use them to draw an ellipse and a rectangle:

var w = 20;

var h = 15;

rect(10, 10, w, h);

ellipse(10, 10, w, h);

How tall is each one of the shapes?

• 5

• 35

• 20

• 15

The following code draws a face with a mouth (with no eyes!), using two variables:

var faceS = 100;

var mouthS = 30;

ellipse(200, 200, faceS, faceS);

ellipse(200, 220, mouthS, mouthS);

How wide is the second ellipse that draws the mouth?

• 30

• 200

• 100

• 130

A variable is a way to store _______.

• vapors

• verbs

• values

• vegetables

Which is the correct way to write a variable?

• var = X

• X = 299

• var = 299

• var X = 299

Which of these is a valid variable name?

• leaf_1

• myVar#!

• $%90);

• 12bucklemyshoe$

Variable names can begin with letters, or the symbols $ or _.

They can only contain letters, numbers, $ and _.  

They cannot begin with a number.

Which of these is a valid variable name?

• leaf_1

• myVar#!

• $%90);

• 12bucklemyshoe$

What should always go at the end of a line of code?

• )

• .

• ;

• %

What is VERY important when writing code?

• pistachio

• order

• banana

• beauty