In a type system, a data type represents a constraint placed upon the interpretation of data, describing representation, interpretation and structure of values or objects stored in computer memory. Because the real numbers are not countable, computers cannot represent them exactly using a finite amount of information Wikimedia commons has media related to data types
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In computer programming, a type or data type is a defined kind of data, that is, a set of possible values and basic operations on those values
In the c programming language, data types constitute the semantics and characteristics of storage of data elements
They are expressed in the language syntax in form of declarations for memory locations or variables Data types also determine the types of operations or methods of processing of data elements. The data type is a fundamental concept in statistics and controls what sorts of probability distributions can logically be used to describe the variable, the permissible operations on the variable, the type of regression analysis used to predict the variable, etc. Algebraic data type in computer programming, especially in functional programming and type theory, an algebraic data type (adt) is a composite data type —a type formed by combining other types
An algebraic data type is defined by two key constructions A sum and a product These are sometimes referred to as or and and types. Value type and reference type in certain computer programming languages, data types are classified as either value types or reference types, where reference types are always implicitly accessed via references, whereas value type variables directly contain the values themselves
For a wider list of terms, see list of terms relating to algorithms and data structures
For a comparison of running times for a subset of this list see comparison of data structures. A real data type is a data type used in a computer program to represent an approximation of a real number
