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Lexikon

Hungarian Notation

e, convention> A linguistic convention requiring one or more letters to be added to the start of ef="module.php?name=Lexikon&file=search&eid=1&query=variable">variable names to denote ef="module.php?name=Lexikon&file=search&eid=1&query=scope">scope and/or ef="module.php?name=Lexikon&file=search&eid=1&query=type">type. Hungarian Notation is mainly confined to ef="module.php?name=Lexikon&file=search&eid=1&query=Microsoft Windows">Microsoft Windows programming environments, such as Microsoft ef="module.php?name=Lexikon&file=search&eid=1&query=C">C, ef="module.php?name=Lexikon&file=search&eid=1&query=C++">C++ and ef="module.php?name=Lexikon&file=search&eid=1&query=Visual Basic">Visual Basic. It was originally devised by {Charles Simonyi}, a Hungarian, who was a senior programmer at ef="module.php?name=Lexikon&file=search&eid=1&query=Microsoft">Microsoft for many years. He disliked the way that names in C programs gave no clue as to the type, leading to frequent programmer errors. According to legend, fellow programmers at Microsoft, on seeing the convoluted, vowel-less variable names produced by his scheme, said, "This might as well be in Greek - or even Hungarian!". They made up the name "Hungarian notation" (possibly with "ef="module.php?name=Lexikon&file=search&eid=1&query=reverse Polish notation">reverse Polish notation" in mind). Hungarian Notation is not really necessary when using a modern ef="module.php?name=Lexikon&file=search&eid=1&query=strongly-typed language">strongly-typed language as the ef="module.php?name=Lexikon&file=search&eid=1&query=compiler">compiler warns the programmer if a variable of one type is used as if it were another type. It is less useful in {object-oriented programming} languages such as {C++}, where many variables are going to be instances of ef="module.php?name=Lexikon&file=search&eid=1&query=classes">classes and so begin with "obj". In addition, variable names are essentially only ef="module.php?name=Lexikon&file=search&eid=1&query=comments">comments, and thus are just as susceptible to becoming out-of-date and incorrect as any other comment. For example, if a ef="module.php?name=Lexikon&file=search&eid=1&query=signed">signed ef="module.php?name=Lexikon&file=search&eid=1&query=short">short ef="module.php?name=Lexikon&file=search&eid=1&query=int">int becomes an unsigned ef="module.php?name=Lexikon&file=search&eid=1&query=long">long int, the variable name, and every use of it, should be changed to reflect its new type. A variable' s name should describe the values it holds. Type and scope are aspects of this, but Hungarian Notation overemphasises their importance by allocating so much of the start of the name to them. Furthermore, type and scope information can be found from the variable' s declaration. Ironically, this is particularly easy in the development environments in which Hungarian Notation is typically used. {Simonyi' s original monograph (http://msdn.microsoft.com/library/techart/hunganotat.htm)}. {Microsoft VB Naming Conventions (http://support.microsoft.com/support/kb/articles/Q110/2/64.asp)}. (2003-09-11)

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