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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Comma operator ： ウィキペディア英語版 Comma operator In the C and C++ programming languages, the comma operator (represented by the token ,) is a binary operator that evaluates its first operand and discards the result, and then evaluates the second operand and returns this value (and type). The use of the comma token as an is distinct from its use in function calls and definitions, variable declarations, enum declarations, and similar constructs, where it acts as a . ==Syntax== The comma operator separates ''expressions'' (which have value) in a way analogous to how the semicolon terminates ''statements,'' and sequences of expressions are enclosed in parentheses analogously to how sequences of statements are enclosed in braces: (a, b, c) is a sequence of expressions, separated by commas, which evaluates to the last expression c while is a sequence of statements, and does not evaluate to any value. A comma can only occur between two expressions – commas ''separate'' expressions – unlike the semicolon, which occurs at the end of a (non-block) statement – semicolons ''terminate'' statements. The comma operator has the lowest precedence of any C operator, and acts as a sequence point. In a combination of commas and semicolons, semicolons have lower precedence than commas, as semicolons separate statements but commas occur within statements, which accords with their use as ordinary punctuation: a, b; c, d is grouped as (a, b); (c, d) because these are two separate statements. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Comma operator」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.