Struct – Definition and meaning

Struct - An introduction

In programming, Struct, short for structure, is an important concept that is used in many programming languages such as C, C++, and Rust. Structs allow developers to group multiple variables (also known as members) under a single name, making it much easier to manage and organise data.

What is a struct?

A struct is a user-defined data type that allows the programmer to combine different data types and create a complex data structure. In contrast to a single variable that stores a specific data type, a struct can contain data of different types that logically belong together.

Applications of structs

Structs are often used to represent complex data sets, such as

• Personal information (name, age, address)
• Geometric shapes (height, width, colour)
• Game elements (position, speed, score)

How do you define a struct?

A struct is normally defined using a special keyword, which varies depending on the programming language. Here are some examples:

// C/C++ example struct Person { char name[50]; int age; char address[100]; }

// Rust example struct Person { name: String, age: u32, address: String, }

Advantages of using structs

The use of structs offers numerous advantages:

• Favouring readability: grouping related data makes the code clearer.
• Simple data manipulation: Structs make it easy to manage complex data together.
• Extensibility: New members can be added to an existing struct without changing the entire structure.

Struct vs. classes - what's the difference?

In many object-oriented programming languages, there are both structs and classes. While both concepts are used to encapsulate data and behaviour, there are some differences:

• Visibility: in many languages, the members of a structs are publicly accessible by default, whereas classes are private.
• Inheritance: Classes support inheritance, while structs usually do not.

Illustrative example on the topic: Struct

Imagine you are developing a game in which you have to manage the properties of various game characters. You could define a struct called Player that stores the character's name, health points and weapon inventory:

struct player { char name[50]; int health points; char weapons[5][30]; // An array for up to 5 weapons }

This allows you to create a new character as follows:

Player player1; strcpy(player1.name, "warrior"); player1.lifepoints = 100; strcpy(player1.weapons[0], "sword")

Using a structs makes the organisation of the data clearer and more accessible, especially if you need to manage several players at the same time.

Conclusion

Structs are a fundamental concept in programming that is widely used in many languages. They allow complex data to be clearly structured and therefore improve the readability and maintainability of the code. If you would like to learn more about related topics, take a look at our encyclopaedia articles on classes and data structures.