Type System

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 from being used with values for which that operation does not make sense (logic errors); memory errors will also be prevented. Type systems are often specified as part of programming languages, and built into the interpreters and compilers for them; although they can also be implemented as optional tools.

In computer science, a type system may be defined as "a tractable syntactic framework for classifying phrases according to the kinds of values they compute".

A compiler may also use the static type of a value to optimize the storage it needs and the choice of algorithms for operations on the value. In many C compilers the float data type, for example, is represented in 32 bits, in accord with the IEEE specification for single-precision floating point numbers. They will thus use floating-point-specific microprocessor operations on those values (floating-point addition, multiplication, etc.).

The depth of type constraints and the manner of their evaluation affect the typing of the language. A programming language may further associate an operation with varying concrete algorithms on each type in the case of type polymorphism. Type theory is the study of type systems, although the concrete type systems of programming languages originate from practical issues of computer architecture, compiler implementation, and language design.

Read more about Type SystemFundamentals, Type Checking, Polymorphism and Types, Specialized Type Systems, Explicit or Implicit Declaration and Inference, Types of Types, Unified Type System, Compatibility: Equivalence and Subtyping, Programming Style

Other articles related to "type system, type, types, type systems, systems":

Type System - Programming Style
... Statically typed languages alert programmers to type errors during compilation, and they may perform better at runtime ... typed languages claim they better support rapid prototyping and that type errors are only a small subset of errors in a program ... Likewise, there is often no need to manually declare all types in statically typed languages with type inference thus, the need for the programmer to explicitly specify types of variables is ...
Type Directors Club - Type Design Awards - Winners By Year
... Alphatier, Azuza, Dearest, Globetrotter, ITC Jeepers, Keester, Media Core 3, Woodley Park Type System Brioso Pro, Federal, Rialto, Siemens 2003 Text Arabic Typesetting, Carlin ...
Lehman's Laws Of Software Evolution - The Laws
... formulated (1974) Continuing Change — E-type systems must be continually adapted or they become progressively less satisfactory ... (1974) Increasing Complexity — As an E-type system evolves its complexity increases unless work is done to maintain or reduce it ... (1974) Self Regulation — E-type system evolution process is self-regulating with distribution of product and process measures close to normal ...
Structural Type System
... A structural type system (or property-based type system) is a major class of type system, in which type compatibility and equivalence are determined by the type's actual structure or definition, and not ... Structural systems are used to determine if types are equivalent and whether a type is a subtype of another ... It contrasts with nominative systems, where comparisons are based on the names of the types or explicit declarations, and duck typing, in which only the part of the structure accessed at ...
Scala (programming Language) - Features (with Reference To Java) - Expressive Type System
... Scala is equipped with an expressive static type system that enforces the safe and coherent use of abstractions ... In particular, the type system supports Classes and abstract types as object members Structural types Path-dependent types Compound types Explicitly typed self references Generic ... This makes most static type declarations optional ...

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