Procedures and functions

Modular design — splitting work into procedures and functions — is expected throughout Paper 1, especially the OOP section.

• Procedure = performs a task; function = returns a value via `Result`.
• Parameters pass data in; `var` parameters let a method change the caller's variable.
• Keep each method short and single-purpose so it is testable and reusable.
• In OOP, methods live inside a class; accessors return attributes, mutators change them, and logic methods classify or calculate.

• Function / procedure — returns a value / performs a task.
• Result — the variable a function assigns to return its value.