What Is the Difference Between Structured Unstructured and Object Oriented Programming?


Angela Bailey

What Is the Difference Between Structured, Unstructured, and Object-Oriented Programming?

Programming is the art of creating instructions for computers to execute. There are various programming paradigms that developers use to design software applications.

Three of the most common paradigms are structured programming, unstructured programming, and object-oriented programming (OOP). In this article, we will explore the differences between these three approaches.

Structured Programming

Structured programming is a procedural programming paradigm that emphasizes code organization and clarity. It involves breaking down a program into smaller, manageable modules called functions or procedures.

These functions are designed to perform specific tasks and can be reused throughout the program.

In structured programming, code execution follows a linear flow. The control structures used include sequence, selection, and iteration. Sequence allows statements to be executed one after another in order.

Selection allows for conditional execution based on certain conditions being met or not met. Iteration allows for repetitive execution of a block of code until a certain condition is satisfied.

Structured programming promotes code maintainability and readability by organizing code into logical blocks. It also reduces complexity by breaking down large programs into smaller modules.

Unstructured Programming

Unstructured programming is an older approach where programs are written without any specific organization or modularization guidelines. This style of coding is highly discouraged in modern software development practices due to its lack of readability and maintainability.

In unstructured programming, code often consists of a series of instructions executed one after another without clear separation or structure. This makes it difficult to understand and modify the program as it grows larger.

Unstructured programming lacks the control structures found in structured programming. This means that code execution can jump from one section to another without any clear flow or organization.

Object-Oriented Programming (OOP)

Object-oriented programming is a programming paradigm that focuses on modeling real-world entities as objects. It involves encapsulating data and behaviors into reusable objects that interact with each other.

In OOP, objects are instances of classes, which act as blueprints for creating objects. Each object has its own state (data) and behavior (methods).

Objects can communicate with each other by invoking methods and sharing data.

The key concepts in OOP include encapsulation, inheritance, polymorphism, and abstraction. Encapsulation ensures that data and methods are bundled together within an object, providing data hiding and access control. Inheritance allows classes to inherit properties and behavior from other classes, enabling code reuse and extensibility.

Polymorphism allows objects of different types to be treated as objects of the same type, simplifying code design. Abstraction allows the creation of abstract classes or interfaces that define common behavior without specifying implementation details.

OOP promotes modularity, reusability, and maintainability by organizing code into classes and objects. It enables developers to model complex systems more accurately by representing entities as objects with well-defined interactions.


In summary, structured programming emphasizes code organization through modularization and follows a linear flow of execution. Unstructured programming lacks organization and is considered outdated.

Object-oriented programming focuses on modeling real-world entities as objects with well-defined interactions through encapsulation, inheritance, polymorphism, and abstraction.

Understanding the differences between these programming paradigms is crucial for developers to choose the most appropriate approach for their projects. Each paradigm has its strengths and weaknesses, and selecting the right one can significantly impact the efficiency and maintainability of software applications.

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