Hungarian notation

related topics
{math, number, function}
{language, word, form}
{theory, work, human}
{law, state, case}
{country, population, people}
{game, team, player}
{style, bgcolor, rowspan}
{work, book, publish}

Hungarian notation is an identifier naming convention in computer programming, in which the name of a variable or function indicates its type or intended use. There are two types of Hungarian notation: Systems Hungarian notation and Apps Hungarian notation.

Hungarian notation was designed to be language-independent, and found its first major use with the BCPL programming language. Because BCPL has no data types other than the machine word, nothing in the language itself helps a programmer remember variables' types. Hungarian notation aims to remedy this by providing the programmer with explicit knowledge of each variable's data type.

In Hungarian notation, a variable name starts with a group of lower-case letters which are mnemonics for the type or purpose of that variable, followed by whatever name the programmer has chosen; this last part is sometimes distinguished as the given name. The first character of the given name can be capitalised to separate it from the type indicators (see also CamelCase). Otherwise the case of this character denotes scope.

Contents

History

The original Hungarian notation, which would now be called Apps Hungarian, was invented by Charles Simonyi, a programmer who worked at Xerox PARC circa 1972-1981, and who later became Chief Architect at Microsoft. It may have been derived from the earlier principle of using the first letter of a variable name to set its type — for example, variables whose names started with letters I through N in FORTRAN were integers by default.

The notation is a reference to Simonyi's nation of origin; Hungarian people's names are "reversed" compared to most other European names; the family name precedes the given name. For example, the anglicized name "Charles Simonyi" in Hungarian was originally "Simonyi Károly". In the same way the type name precedes the "given name" in Hungarian notation rather than the more natural, to most Europeans, Smalltalk "type last" naming style e.g. aPoint and lastPoint. This latter naming style was most common at Xerox PARC during Simonyi's tenure there. It may also be inspired by play on the name of an almost entirely unrelated concept, Polish notation.

The name Apps Hungarian was coined since the convention was used in the applications division of Microsoft. Systems Hungarian developed later in the Microsoft Windows development team. Simonyi's paper referred to prefixes used to indicate the "type" of information being stored. His proposal was largely concerned with decorating identifier names based upon the semantic information of what they store (in other words, the variable's purpose), consistent with Apps Hungarian. However, his suggestions were not entirely distinct from what became known as Systems Hungarian, as some of his suggested prefixes contain little or no semantic information (see below for examples).

Full article ▸

related documents
Formal language
Reserved word
Decimal separator
Caesar cipher
Esoteric programming language
Multiplication table
Substitution cipher
Semi-continuity
Ternary numeral system
Elliptic function
Counting sort
Pre-Abelian category
Conjugacy class
Bounded set
Lambert W function
Tuple
ZPP
Binary space partitioning
Shannon–Fano coding
Fermat's little theorem
Enriched category
Grep
Loss of significance
Linear classifier
Dedekind cut
Floor and ceiling functions
Five lemma
Distributivity
Entailment
Burali-Forti paradox