Which Is Not User-Defined Data Type?


Larry Thompson

Which Is Not User-Defined Data Type?

When it comes to programming, data types play a crucial role in defining the nature of variables or values that can be stored and manipulated. User-defined data types allow programmers to create their own custom data types based on their specific requirements. These user-defined data types can be created using structures, classes, or enumerations.

However, there are certain built-in data types that are not considered user-defined. Let’s explore which data types fall into this category.

Primitive Data Types

The most commonly used data types in programming languages are primitive data types. These are predefined by the language itself and cannot be modified or extended by users.

Primitive data types typically include integers, floating-point numbers, characters, and boolean values. They are the building blocks of any programming language and provide a basic level of functionality.


Integers represent whole numbers without any decimal points. They can be both positive and negative, allowing programmers to perform arithmetic operations like addition, subtraction, multiplication, and division.

Floating-Point Numbers

Floating-point numbers represent real numbers with decimal points. They allow for greater precision compared to integers and are often used for scientific calculations or when dealing with fractional values.


Characters represent individual symbols within a programming language’s character set. They can include letters, digits, punctuation marks, or special characters.

Characters are often used for tasks like input/output operations or representing textual information.

Boolean Values

Boolean values denote logical states such as true or false. They are primarily used in conditional statements or expressions that require binary outcomes.

Derived Data Types

Apart from primitive data types, programming languages also provide derived data types. These are created by combining or extending the existing primitive or user-defined data types.

Examples of derived data types include arrays, strings, pointers, and structures.


Arrays allow programmers to store multiple elements of the same data type in a contiguous memory block. They provide a convenient way to work with collections of values and can be indexed to access individual elements.


Strings are used to represent sequences of characters. They are widely used for text manipulation and processing tasks.

In some programming languages, strings are considered as a separate data type, while in others they can be treated as an array of characters.


Pointers store memory addresses rather than actual values. They enable efficient memory management and facilitate operations like dynamic memory allocation and manipulation.


Structures allow programmers to combine different data types into a single entity. They provide a way to create custom complex data structures that can hold multiple values under one name.

User-Defined Data Types

Now that we have discussed the various built-in or derived data types, let’s understand what constitutes a user-defined data type. User-defined data types are created by programmers using structures, classes, or enumerations provided by the programming language.

By defining their own structures or classes, programmers can create custom data types tailored to their specific needs.

In Conclusion

In summary, the not user-defined data types are primitive and derived data types that come pre-defined in programming languages. These include integers, floating-point numbers, characters, boolean values, arrays, strings, pointers, and structures.

On the other hand, user-defined data types are created using structures, classes, or enumerations. Understanding the distinctions between these different data types is crucial for effective programming and data manipulation.

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