C中语句的最大长度 [英] Maximum length of statement in C

问题描述

在C中定义的语句是否有最大长度？

编译器是gcc

解决方案

：

c11

5.2.4.1翻译范围

1执行应能够翻译和执行至少一个程序，
至少包含以下每一个限制的一个实例：

[...]

- 逻辑源代码行中的4095个字符

标准建议实现应该尽量避免强加固定的翻译限制。

逻辑源代码行是反斜线 - 换行拼接的结果（5.1。 1.2：1.2），所以这不会直接覆盖语句中字符数的最小限制。

Howeve r，因为另一个转换限制要求是：

lockquote

- 字符串文字中4095个字符（连接后）

以及字符串文字只能出现在语句中，因此实现必须接受至少一个4095字符的语句。

忽略文字，我们也看到：

lockquote

- 在一个函数调用中有127个参数

，并且作为函数调用，每个参数必须包含至少2个字符，并加上4个调用（ f（0,0，...） ; ），我们的最小线长度限制为260美元。

Is there a maximum length for a statement defined in C?

compiler is gcc

解决方案

The standard specifies a minimum translation limit:

c11

5.2.4.1 Translation limits

1 The implementation shall be able to translate and execute at least one program that contains at least one instance of every one of the following limits:

[...]

— 4095 characters in a logical source line

The standard recommends however that "implementations should avoid imposing fixed translation limits whenever possible".

A logical source line is the result of backslash-newline splicing (5.1.1.2:1.2), so this doesn't directly cover the minimum limit for the number of characters in a statement.

However, because another translation limit requirement is:

— 4095 characters in a string literal (after concatenation)

and as string literals may only occur in statements, it follows that the implementation must accept at least one 4095-character statement.

Ignoring literals, we also see:

— 127 arguments in one function call

and as a function call must include at least 2 characters per argument, plus 4 for the invocation (f(0,0,...);) we arrive at a minimum line length limit of 260.

这篇关于C中语句的最大长度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！