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Concatenation : ウィキペディア英語版
Concatenation

In formal language theory and computer programming, string concatenation is the operation of joining character strings end-to-end. For example, the concatenation of "snow" and "ball" is "snowball". In some but not all formalisations of concatenation theory, also called string theory, string concatenation is a primitive notion.
==Syntax==
In many programming languages, string concatenation is a binary infix operator. The + (plus) operator is often overloaded to denote concatenation for string arguments: "Hello, " + "World" has the value "Hello, World". In other languages there is a separate operator, particularly to specify implicit type conversion to string, as opposed to more complicated behavior for generic plus. Examples include . in Edinburgh IMP, Perl, and PHP, and & in Ada and Visual Basic.〔(Concatenation Operators in Visual Basic )〕 Other syntax exists, like || in PL/I and Oracle Database SQL.〔(Concatenation Operator )〕
In a few languages, notably C, C++, and Python, there is string literal concatenation, meaning that adjacent string literals are concatenated, without any operator: "Hello, " "World" has the value "Hello, World". In other languages, concatenation of string literals with an operator is evaluated at compile time, via constant folding.

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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