Variables & Data Types

Variables store values your program can use and change. Think of a variable as a labeled box.

• Each variable has a type that defines what it can hold.
• Names should be short and meaningful (e.g., count, price).
• Use one variable per distinct piece of information.

Primitive types:

• int: whole numbers (e.g., 0, 7, -12)
• double: decimals (e.g., 3.5, -0.25)
• boolean: true or false
• char: one character

String holds text (it is a class, not a primitive): String name = "Ada";