C语言中变量和数据对象之间的区别? [英] Difference between variable and data object in C language?

问题描述

我正在阅读C Primer Plus，遇到了我不理解的以下内容-

I was reading C Primer Plus and came across the following lines that I couldn't understand-

指针?这些是什么?基本上，指针是一个变量(或者，更多 通常，一个数据对象)的值是一个内存地址.

Pointers? What are they? Basically, a pointer is a variable (or, more generally, a data object)whose value is a memory address.

仅供参考，我之前遇到过这些问题-

Just for reference,I came across these lines earlier-

考虑分配声明.其目的是将值存储在 内存位置.数据对象是数据区域的通用术语 可用于保存值的存储. C标准仅使用 这个概念的术语对象.识别对象的一种方法是 使用变量名.

Consider an assignment statement. Its purpose is to store a value at a memory location. Data object is a general term for a region of data storage that can be used to hold values. The C standard uses just the term object for this concept. One way to identify an object is by using the name of a variable.

我尝试了Google搜索，但找不到任何东西.这些基本术语使我感到困惑，因此请帮助我理解这些术语.

I tried googleing but couldn't find anything.These basic terminologies are confusing me so please help me understand these terms.

推荐答案

数据对象是存储程序使用的信息的内存位置.

A data object is a memory location that stores information used by the program.

变量是程序中用于引用数据对象的名称.

A variable is a name used in the program to refer to a data object.

所以，如果您写:

int a;

它告诉编译器创建一个可以容纳整数的数据对象，并且在程序中您可以使用名称a来访问该数据对象.

it tells the compiler to create a data object that can hold an integer, and in the program you can use the name a to access that data object.

指针是一个数据对象，其值是某些其他数据对象在内存中的位置.因此，如果您这样做:

A pointer is a data object whose value is the location in memory of some other data object. So if you do:

int *pa = &a;

您正在创建一个变量pa，该变量引用一个数据对象，其内容是根据a变量声明创建的数据对象的地址.

you're creating a variable pa that refers to a data object whose contents are the address of the data object created as a result of the a variable declaration.

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