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Xyzzy (computing)
Xyzzy is a magic word from the ''Colossal Cave Adventure'' computer game.〔(xyzzy ) in the Jargon File.〕 In computing, the word is sometimes used as a metasyntactic variable or as a video game cheat code, the canonical "magic word".
==Origin==
Modern usage is primarily from one of the earliest computer games, ''Colossal Cave Adventure'', in which the idea is to explore an underground cave with many rooms, collecting the treasures found there. By typing "xyzzy" at the appropriate time, the player could move instantly between two otherwise distant points. As ''Colossal Cave Adventure'' was both the first adventure game and the first interactive fiction, hundreds of later interactive fiction games included responses to the command "xyzzy" in tribute.〔(【引用サイトリンク】title=xyzzy responses ) A web page giving responses to "xyzzy" in many games of interactive fiction〕
The origin of the word has been the subject of debate. According to Rick Adams, the sequence of letters "XYZZY" has been used as a mnemonic to remember the process for computing cross products.〔(【引用サイトリンク】 Everything you ever wanted to know about…the magic word XYZZY )〕 Crowther, author of ''Colossal Cave Adventure'', states that he was unaware of the mnemonic, and that he "made it up from whole cloth" when writing the game.〔(【引用サイトリンク】 Somewhere Nearby is Colossal Cave: Examining Will Crowther's Original "Adventure" in Code and in Kentucky )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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