Question

In most languages, a module definition has what two parts?

Short answer

Answer: The two main parts of a module definition are the interface and the implementation. The interface defines the functions, classes, and data structures that are exposed to the user or other modules, serving as a contract that specifies the module's features. The implementation consists of the actual code and logic behind the interface, providing the functionality of the module while remaining hidden from the user or other modules.

Step-by-step solution

Definition of a Module

A module is a group of related functions, classes, and data structures organized into a single file or package. They provide modularity and enable code reusability.

Part 1: Interface

The interface of a module defines the functions, classes, and data structures that are exposed to the user or other modules. It serves as a contract, specifying what features can be used by the client code. The interface can also include documentation on how to use the module and its features.

Part 2: Implementation

The implementation of a module consists of the actual code and logic behind the functions, classes, and data structures defined in the interface. This part is hidden from the user or other modules, and they interact with the module solely through the interface. The implementation can be changed without affecting the clients as long as the interface remains consistent.