Constants and variables

Learning Intentions & Success Criteria

Learning intentions (He koronga ako):

• What constants and variables are used for
• How to store values in constants and variables
• How to use constants and variables with the print function

Success criteria (He paearu angitū):

• You can explain the difference between a constant and a variable
• Your program:
  1. Declares at least one constant and at least one variable
  2. Assigns values to the constant and variable
  3. Displays the constant and variable values using the print() function

Constants and variables

Ngā taurangi me ngā kauriterite

What are constants and variables?

• In computer programming, constants and variables are like containers that store information.
• Think of them like boxes with labels on them.
• Inside the box is a piece of data (like a name or a number), and the label is the name you give that container.

Constants vs. Variables

• Constant: A container for a value that cannot change once it’s been set. Think of it like a permanent marker.
• Variable: A container for a value that can change while the program is running. Think of it like a whiteboard.

Declaring a constant

• In Swift, we use the let keyword to declare a constant.
• Use a constant when you know a value will stay the same throughout your program (e.g., your date of birth).

```swift let name = “Rāwiri”