什么是“指定对象”用C是什么意思？ [英] What does 'designate an object' mean in C?

问题描述

例如，

  INT X = 10;
 

我们说， X 指定存储10 int对象。但什么是指定究竟是什么意思？这是否意味着 X 的行为就像是指内存的整个块的标签？

解决方案

1. X 是标识符的


2. 有一个 INT 对象（即存储的区域）包含值 10 。


3. 标识符 X 是与 INT 对象关联。

C标准使用英文单词候来恩preSS的之间的关系识别符和它标识对象。你可以说，在几种不同的方式同样的事情。我说：联想只是现在，还有我们可以选择很多的话。 X 是本地区一个内存标签将是另一种方式。

注意：指定不局限于标识符。其他前pressions可以指定一个对象了。例如 *（＆安培; X）也表示相同的对象一样， *（＆安培; X + 0）

当一个前pression指定的对象，前pression可用于一个值分配给对象，或检索从对象的值。 （同样的语法涵盖的那些情况下，它依赖于上下文的值是否是读或写）。

字的左值的指前pression可能会指定一个对象（按候的上述定义）。

For example,

int x = 10;

we say that "x designates an int object which stores 10". But what does "designate" exactly mean? Does it mean x behaves like a label which refers to the whole chunk of memory?

解决方案

1. x is an identifier.
2. There is an int object (i.e. a region of storage) containing the value 10.
3. The identifier x is associated with that int object.

The C standard uses the English word designate to express the relationship between an identifier and the object it identifies. You could say the same thing in several different ways. I said "associate" just now, there are many words we could choose. "x is a label for this region of memory" would be another way.

Note: designating is not limited to identifiers. Other expressions can designate an object too. For example *(&x) also designates the same object, as does *(&x + 0).

When an expression designates an object, the expression may be used to either assign a value to the object, or retrieve the value from the object. (The same syntax covers both of those cases; it depends on context whether the value is read or written).

The word lvalue means an expression that might designate an object (according to the above definition of 'designate').

这篇关于什么是“指定对象”用C是什么意思？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！