An abstract data type is defined only by a set of its characteristics
An Abstract Data Type (ADT) is a mathematical model of a specific category of data structures in computer science that has similar behavior; or a data type that has similar semantics to one or more programming languages.
Abstract data type: refers to a mathematical model and a set of operations defined on the model. The definition of an abstract data type only depends on its set of logical characteristics, and has nothing to do with how it is represented and implemented inside the computer. That is, no matter how its internal structure changes, as long as its mathematical characteristics remain unchanged, it will not affect other external uses. (Recommended learning: web front-end video tutorial)
Representation and implementation of abstract data types: It can be represented and implemented through inherent data types. That is, the data types already stored in the processor are used to describe new structures, and new operations are combined with already implemented operations.
Take a linear table as an example. The relationship between the two: the definition of an abstract data type linear table is only an abstract linear table in logical order, and its storage structure has not yet been involved. The representation is to establish the The storage structure of the linear table is implemented by writing specific algorithms through some specific programming languages, and then obtaining the results through the algorithms.
It can be summarized that their relationship is a process from abstract logical order to concrete implementation of algorithms.
Abstract data type (ADT) is a purely theoretical entity used to simplify the description of abstract algorithms, classify and evaluate data structures, and formally describe the type system of programming languages.
An ADT can be implemented using a specific data type or data structure. There are many ways to implement it in many programming languages; or it can be described in a formal specification language.
ADT is often implemented as a module: the module's interface declares the routine (procedure) corresponding to the ADT operation, and sometimes uses comments to describe the constraints.
Abstract data type (ADT, Abstract Data Type) refers to a mathematical model and a set of operations defined on this mathematical model. It is usually some kind of abstraction of data, defining the value range of the data and its structural form, as well as a collection of data operations.
For example, there are "integer" types in various high-level programming languages. Although they are implemented in different ways on different processors, they are "the same" to programmers, that is, the mathematical properties are the same . From the perspective of "mathematical abstraction", it can be called an "abstract data type".
The characteristic of abstract data types is to separate usage and implementation, thereby encapsulating and hiding information. Abstract data types are implemented in a certain part of the program through a specific data structure. They only care about the operations on this data type and do not care about the specific implementation of the data structure.
The above is the detailed content of An abstract data type is defined only by a set of its characteristics. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What data type should be used for gender field in MySQL database?
Mar 14, 2024 pm 01:21 PM
In a MySQL database, gender fields can usually be stored using the ENUM type. ENUM is an enumeration type that allows us to select one as the value of a field from a set of predefined values. ENUM is a good choice when representing a fixed and limited option like gender. Let's look at a specific code example: Suppose we have a table called "users" that contains user information, including gender. Now we want to create a field for gender, we can design the table structure like this: CRE
How to convert php8 data types
Nov 16, 2023 pm 02:51 PM
The methods of the php8 data type include converting strings to integers, converting integers to strings, converting strings to floating point numbers, converting floating point numbers to strings, converting arrays to strings, converting strings to arrays, and converting Boolean values to integers. Integer conversion to Boolean value and variable type determination and conversion. Detailed introduction: 1. Converting a string to an integer includes the intval() function and (int) forced type conversion; 2. Converting an integer to a string includes the strval() function and (string) forced type conversion; 3. Converting a string to a float Points and so on.
What is the best data type for gender fields in MySQL?
Mar 15, 2024 am 10:24 AM
In MySQL, the most suitable data type for gender fields is the ENUM enumeration type. The ENUM enumeration type is a data type that allows the definition of a set of possible values. The gender field is suitable for using the ENUM type because gender usually only has two values, namely male and female. Next, I will use specific code examples to show how to create a gender field in MySQL and use the ENUM enumeration type to store gender information. The following are the steps: First, create a table named users in MySQL, including
What are the python data types?
Dec 11, 2023 pm 04:17 PM
Python data types are: 1. Integer type; 2. Floating point type; 3. Complex number; 4. Boolean type; 5. String; 6. List; 7. Tuple; 8. Set; 9. Dictionary. Detailed introduction: 1. Integer type, used to represent integers, which can be positive, negative, or zero. In Python, the range of values that integers can represent is platform-specific; 2. Floating point type, used to represent numbers with decimal parts. Numbers, floating point type can represent positive numbers, negative numbers and zero; 3. Complex numbers, used to represent complex numbers, including real and imaginary parts; 4. Boolean type, used to represent Boolean values, etc.
Mind map of Python syntax: in-depth understanding of code structure
Feb 21, 2024 am 09:00 AM
Python is widely used in a wide range of fields with its simple and easy-to-read syntax. It is crucial to master the basic structure of Python syntax, both to improve programming efficiency and to gain a deep understanding of how the code works. To this end, this article provides a comprehensive mind map detailing various aspects of Python syntax. Variables and Data Types Variables are containers used to store data in Python. The mind map shows common Python data types, including integers, floating point numbers, strings, Boolean values, and lists. Each data type has its own characteristics and operation methods. Operators Operators are used to perform various operations on data types. The mind map covers the different operator types in Python, such as arithmetic operators, ratio
Detailed explanation of how to use Boolean type in MySQL
Mar 15, 2024 am 11:45 AM
Detailed explanation of how to use Boolean types in MySQL MySQL is a commonly used relational database management system. In practical applications, it is often necessary to use Boolean types to represent logical true and false values. There are two representation methods of Boolean type in MySQL: TINYINT(1) and BOOL. This article will introduce in detail the use of Boolean types in MySQL, including the definition, assignment, query and modification of Boolean types, and explain it with specific code examples. 1. The Boolean type is defined in MySQL and can be
What is the best data type choice for gender field in MySQL?
Mar 14, 2024 pm 01:24 PM
When designing database tables, choosing the appropriate data type is very important for performance optimization and data storage efficiency. In the MySQL database, there is really no so-called best choice for the data type to store the gender field, because the gender field generally only has two values: male or female. But for efficiency and space saving, we can choose a suitable data type to store the gender field. In MySQL, the most commonly used data type to store gender fields is the enumeration type. An enumeration type is a data type that can limit the value of a field to a limited set.
Introduction to basic syntax and data types of C language
Mar 18, 2024 pm 04:03 PM
C language is a widely used computer programming language that is efficient, flexible and powerful. To be proficient in programming in C language, you first need to understand its basic syntax and data types. This article will introduce the basic syntax and data types of C language and give examples. 1. Basic syntax 1.1 Comments In C language, comments can be used to explain the code to facilitate understanding and maintenance. Comments can be divided into single-line comments and multi-line comments. //This is a single-line comment/*This is a multi-line comment*/1.2 Keyword C language