用空格隔开两个字符串被自动连接起来 [英] two strings separated by blank being concatenated automatically

问题描述

我刚刚找到了它是由我的错字介绍非常有趣。在这里，很容易code脚本示例：

I just found something very interesting which was introduced by my typo. Here's a sample of very easy code script:

printf("A" "B");

其结果将是

$> AB

有人能解释这是如何发生的？

Can someone explain how this happens?

推荐答案

由于C标准的一部分，字符串是一个接一个地被连接起来：

As a part of the C standard, string literals that are next to one another are concatenated:

有关C（报价C99，C11，但在6.4.5p5类似的东西）：

For C (quoting C99, but C11 has something similar in 6.4.5p5):

（C99，6.4.5p5）在翻译阶段6，多字节字符
  由相邻字符的任何序列指定序列和
  identically- prefixed字符串令牌连接成
  单一的多字节字符序列。

(C99, 6.4.5p5) "In translation phase 6, the multibyte character sequences specified by any sequence of adjacent character and identically-prefixed string literal tokens are concatenated into a single multibyte character sequence."

C ++也有类似的标准。

C++ has a similar standard.

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