对C中指针的有效操作 [英] Valid operations on pointers in C

问题描述

为什么C中允许分区/多元化/添加指针不允许
？

Why division/mulitiplication/addition of pointers are not
allowed in C?

推荐答案

aruna< ar ********@yahoo.co.in>潦草地写了下面的内容：

aruna <ar********@yahoo.co.in> scribbled the following:

为什么在C中不允许分区/多指/添加指针？

Why division/mulitiplication/addition of pointers are not
allowed in C?

首先定义它是怎么回事会工作，然后我们会明白为什么它应该或

不应该被允许。


-

/ - Joona Palaste（pa*****@cc.helsinki.fi）-------------芬兰-------- \

\ - http://www.helsinki.fi/~palaste - --------------------规则！ -------- /

显而易见的数学突破将是开发一种简单的方法来获得大额素数。

- 比尔盖茨

First define how it would work, and then we''ll see why it should or
should not be allowed.

--
/-- Joona Palaste (pa*****@cc.helsinki.fi) ------------- Finland --------\
\-- http://www.helsinki.fi/~palaste --------------------- rules! --------/
"The obvious mathematical breakthrough would be development of an easy way to
factor large prime numbers."
- Bill Gates

" aruna" < AR ******** @ yahoo.co.in>在留言中写道

新闻：a2 ************************** @ posting.google.c om ...

"aruna" <ar********@yahoo.co.in> wrote in message
news:a2**************************@posting.google.c om...

为什么在C中不允许分区/多重/添加指针？

Why division/mulitiplication/addition of pointers are not
allowed in C?

这些操作没有明显的意义，所以没有必要。

Those operations have no obvious meaning, so there is no need.

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哈希：SHA1
< br $> b $ b aruna写道：


|为什么划分/多指/添加指针不是

|允许在C？


指针可以被认为是数据项的位置。


减去一个指针来自另一个给你两个数据项之间的''距离'。


两个指针的添加内容会给你什么？ （提示：''橡树巷'''到'757 Main Street West'的'

'给你什么？'


什么会两个指针的乘法给你？ （提示：''12 Oak Lane''与''757 Main Street West''相加的是什么？$

什么会两个指针的划分给你？ （提示：''橡树巷'''到'757 Main Street West'的

分区是什么给你的？）


而指针减法是有意义的，其他操作则没有。


- -

Lew Pitcher，IT顾问，企业应用程序架构

企业技术解决方案，道明银行金融集团


（这里表达的意见是我自己的，不是我的雇主的）

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aruna wrote:

| Why division/mulitiplication/addition of pointers are not
| allowed in C?

A pointer can be considered to be the ''location'' of a data item.

Subtraction of one pointer from another gives you the ''distance'' between
two data items.

What would addition of two pointers give you? (Hint: What does the
addition of ''12 Oak Lane'' to ''757 Main Street West'' give you?)

What would multiplication of two pointers give you? (Hint: What does the
multiplication of ''12 Oak Lane'' with ''757 Main Street West'' give you?)

What would division of two pointers give you? (Hint: What does the
division of ''12 Oak Lane'' by ''757 Main Street West'' give you?)

While pointer subtraction is meaningful, the other operations are not.

- --

Lew Pitcher, IT Consultant, Enterprise Application Architecture
Enterprise Technology Solutions, TD Bank Financial Group

(Opinions expressed here are my own, not my employer''s)
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