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Variable (computer science)
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- Snippet from Wikipedia: Variable (computer science)
In computer programming, a variable is an abstract storage location paired with an associated symbolic name, which contains some known or unknown quantity of data or object referred to as a value; or in simpler terms, a variable is a named container for a particular set of bits or type of data (like integer, float, string etc...). A variable can eventually be associated with or identified by a memory address. The variable name is the usual way to reference the stored value, in addition to referring to the variable itself, depending on the context. This separation of name and content allows the name to be used independently of the exact information it represents. The identifier in computer source code can be bound to a value during run time, and the value of the variable may thus change during the course of program execution.
Variables in programming may not directly correspond to the concept of variables in mathematics. The latter is abstract, having no reference to a physical object such as storage location. The value of a computing variable is not necessarily part of an equation or formula as in mathematics. Variables in computer programming are frequently given long names to make them relatively descriptive of their use, whereas variables in mathematics often have terse, one- or two-character names for brevity in transcription and manipulation.
A variable's storage location may be referenced by several different identifiers, a situation known as aliasing. Assigning a value to the variable using one of the identifiers will change the value that can be accessed through the other identifiers.
Compilers have to replace variables' symbolic names with the actual locations of the data. While a variable's name, type, and location often remain fixed, the data stored in the location may be changed during program execution.
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Variables and Data Types, Control Structures, Functions and Methods, Object-Oriented Programming (OOP), Functional Programming, Procedural Programming, Event-Driven Programming, Concurrent and Parallel Programming, Error Handling and Debugging, Memory Management, Recursion, Algorithms, Data Structures, Design Patterns, Software Development Life Cycle (SDLC), Version Control Systems, Database Programming, Web Development, Mobile App Development, Game Development, Machine Learning and AI Programming, Network Programming, API Development, Security in Programming, Testing and Quality Assurance, User Interface and User Experience Design, Scripting Languages, Assembly Language, High-Level Programming Languages, Low-Level Programming Languages, Compiler Design, Interpreter Design, Garbage Collection, Regular Expressions, Graphical User Interface (GUI) Programming, Command Line Interface Development, Cross-Platform Development, Cloud Computing in Programming, Blockchain Programming, IoT Programming, Embedded Systems Programming, Microservices Architecture, Serverless Architecture, Big Data Technologies, Data Visualization, Data Mining and Analysis, Natural Language Processing (NLP), Computer Graphics Programming, Virtual Reality (VR) Development, Augmented Reality (AR) Development, Cryptography in Programming, Distributed Systems, Real-Time Systems Programming, Operating System Development, Compiler and Interpreter Development, Quantum Computing, Software Project Management, Agile Methodologies, DevOps Practices, Continuous Integration and Continuous Deployment (CI/CD), Software Maintenance and Evolution, Software Licensing, Open Source Development, Accessibility in Software Development, Internationalization and Localization, Performance Optimization, Scalability Techniques, Code Refactoring, Design Principles, API Design, Data Modeling, Software Documentation, Peer-to-Peer Networking, Socket Programming, Front-End Development, Back-End Development, Full Stack Development, Secure Coding Practices, Code Reviews, Unit Testing, Integration Testing, System Testing, Functional Programming Paradigms, Imperative Programming, Declarative Programming, Software Architecture, Cloud-Native Development, Infrastructure as Code (IaC), Ethical Hacking for Developers, Artificial Intelligence Ethics in Programming, Software Compliance and Standards, Software Auditing, Debugging Tools and Techniques, Code Optimization Techniques, Software Deployment Strategies, End-User Computing, Computational Thinking, Programming Logic and Techniques, Advanced Data Management
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