A type system associates a type with each computed value. By examining the flow of these values, a type system attempts to ensure or prove that no type errors can occur. The particular type system in question determines exactly what constitutes a type error, but in general the aim is to prevent operations expecting a certain kind of value being used with values for which that operation does not make sense; memory errors will also be prevented.
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Typing
Typing is the process of inputting text into a device, such as a typewriter, cell phone, computer, or a calculator, by pressing keys on a keyboard. It can be distinguished from other means of input, such as the use of pointing devices like the computer mouse, and text input via speech recognition. The world's first typist was Lillian Sholes from Wisconsin. She was the daughter of Christopher Sholes, the man who invented the first practical typewriter.
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Universal quantification
In predicate logic, universal quantification formalizes the notion that something is true for everything, or every relevant thing. The resulting statement is a universally quantified statement, and we have universally quantified over the predicate. In symbolic logic, the universal quantifier (typically, U+2200 ¿, a turned A) is the symbol used to denote universal quantification, and is often informally read as "given any" or "for all".
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Existential quantification
In predicate logic, an existential quantification is the predication of a property or relation to at least one member of the domain. It is denoted by the logical operator symbol ¿ (pronounced "there exists" or "for some"), which is called the existential quantifier. Existential quantification is distinct from universal quantification ("for all"), which asserts that the property or relation holds for any members of the domain.
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Core language
In computer programming, the core language is the definition of a programming language plus any standard libraries. Identifiers which are reserved for core usage are known as "keywords". The C standard runtime library and the core Java packages are two examples of components of their respective core languages. The C++ Programming language has a vast library called the C++ Standard Library.
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Haskell (programming language)
Haskell is a standardized, general-purpose purely functional programming language, with non-strict semantics and strong static typing. It is named after logician Haskell Curry. In Haskell, "a function is a first-class citizen" of the programming language. As a functional programming language, the primary control construct is the function.
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Expression (mathematics)
In mathematics, an expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Symbols can designate numbers, variables, operations, functions, and other mathematical symbols, as well as punctuation, symbols of grouping, and other syntactic symbols.
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Dynamic programming language
This article is about a class of programming languages, for the method for reducing the runtime of algorithms, see Dynamic programming. Dynamic programming language is a term used broadly in computer science to describe a class of high-level programming languages that execute at runtime many common behaviors that other languages might perform during compilation, if at all.
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