Variables represent values that can change during a program, while constants represent fixed values that cannot change. Variable names must start with a letter or underscore and can include letters, numbers, and underscores, but cannot be a single number. Constants can help simplify code by only requiring updates in one place if values need to change. On a game show, variables could be used for scores that update during gameplay, while constants could be used for fixed values like question point values.

1. Constants and Variables

2. Variables
• Values which can change
• The name of a variable can be as short as a
single letter but cannot be a single number
• The name of a variable can start with a letter
or an underscore
• After the first character, any letters, numbers
or underscores can be used
• Some programming languages have reserved
words – the variable cannot be one of these

3. Constants
• Values which cannot change
• Can help the source code simpler to
understand
• If updates are needed and constant values are
used, they only need updating once

4. Question
• Where would you use constants and variables
on a game show?