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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallA programming-language standard is an authoritative specification of a language: it defines what programs can mean and what conforming implementations must support. It gives programmers, compiler authors and runtime developers a shared target, but it is not itself a compiler and does not promise that every implementation supports every optional feature or behaves identically in every environment.
What does a programming-language standard define?
A standard describes the rules of a language and the requirements for software that claims to implement it. Depending on the language and the document’s scope, it can specify:
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- Syntax and constraints: which program forms are valid and what restrictions apply.
- Semantics: what valid programs mean, including how language constructs behave.
- Types, values, libraries and interfaces: the features and services an implementation is expected to provide.
- Representations and limits: matters such as input and output representation or implementation limits, where the standard addresses them.
The C committee’s N843 draft illustrates this breadth, but it is a 1998 draft and should not be treated as current C guidance. The ECMAScript 2022 specification, by contrast, states that a conforming implementation must provide and support the types, values, objects, properties, functions, syntax and semantics described in that edition.
How is a standard different from a compiler or runtime?
The standard is the specification—the target. A compiler, interpreter or runtime is an implementation that attempts to meet that target. Implementations can also add vendor extensions beyond what the standard requires.
Conformance is judged against the requirements actually written in the applicable edition. A standard may leave some choices implementation-defined, make features optional, or allow platform-specific behavior. As a result, conforming implementations need not offer every optional facility, and code that relies on an extension or a permitted implementation choice may not work the same way elsewhere.
Why do programming languages have standards?
Standards provide a shared reference for people who write programs and organizations that build compilers, runtimes and related interfaces. That common target helps software move between implementations and environments, although portability still depends on using required, consistently supported behavior rather than relying on extensions or unspecified assumptions.
Within ISO and IEC, ISO/IEC JTC 1/SC 22 is responsible for programming languages, their environments and system software interfaces. ISO describes the committee as a portability subcommittee. Its committee page listed 109 published standards and 14 standards under development when accessed on October 7, 2026; those are portfolio counts for the committee, not counts of languages or compilers, and can change.
Examples: C++, ECMAScript and standards bodies
C++
C++ is standardized internationally. The ISO catalogue identifies ISO/IEC 14882:2024 as the current edition, with earlier editions shown as withdrawn. The IEC record for ISO/IEC 14882:2017 also notes that a more recent version exists. Cite the edition number when referring to a standard: status can change when a newer edition replaces an older one.
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ECMAScript
ECMAScript is specified by Ecma International. The ECMAScript 2022 Language Specification defines that edition of the general-purpose language and sets out conformance requirements. It is an example of an edition-specific specification, not evidence that 2022 is the latest edition.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to check which standard applies
When a language or tool claims to support a standard, identify the exact edition and scope rather than relying on the word “standard” alone. Check:
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- Scope: Which language features, libraries, runtime behavior and interfaces are covered?
- Conformance: What is required, and where does the specification allow optional features, implementation choices or extensions?
- Edition status: Is the edition current, withdrawn or superseded?
- Authority: Which organization maintains the specification, and where is its authoritative text published?
These checks help distinguish a normative language specification from a compiler’s feature list, a coding-style guide or a conformance test suite. A test suite can check selected behavior; it does not replace the standard that defines the requirements.
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