1

A12.3 Macro Definition and Expansion

A control line of the form
#define identifier token-sequence
causes the preprocessor to replace subsequent instances of the identifier with the given
sequence of tokens; leading and trailing white space around the token sequence is dis-
carded. A second #define for the same identifier is erroneous unless the second token
sequence is identical to the first, where all white space separations are taken to be
equivalent

這段其中有一個小段，我看了許久才知道作者想要表達什麼，
A second #define for the same identifier is erroneous unless the second token
sequence is identical to the first

#define A 123
#define A 1234 <<<==== warning message

The C programming language [book]的更多相关文章

  1. iOS Swift-元组tuples(The Swift Programming Language)

    iOS Swift-元组tuples(The Swift Programming Language) 什么是元组? 元组(tuples)是把多个值组合成一个复合值,元组内的值可以使任意类型,并不要求是 ...

  2. iOS Swift-控制流(The Swift Programming Language)

    iOS Swift-控制流(The Swift Programming Language) for-in 在Swift中for循环我们可以省略传统oc笨拙的条件和循环变量的括号,但是语句体的大括号使我 ...

  3. iOS Swift-简单值(The Swift Programming Language)

    iOS Swift-简单值(The Swift Programming Language) 常量的声明:let 在不指定类型的情况下声明的类型和所初始化的类型相同. //没有指定类型,但是初始化的值为 ...

  4. Java Programming Language Enhancements

    引用:Java Programming Language Enhancements Java Programming Language Enhancements Enhancements in Jav ...

  5. The Swift Programming Language 英文原版官方文档下载

    The Swift Programming Language 英文原版官方文档下载 今天Apple公司发布了新的编程语言Swift(雨燕)将逐步代替Objective-C语言,大家肯定想学习这个语言, ...

  6. The Swift Programming Language 中文翻译版（个人翻新随时跟新）

    The Swift Programming Language --lkvt 本人在2014年6月3日(北京时间)凌晨起来通过网络观看2014年WWDC 苹果公司的发布会有iOS8以及OS X 10.1 ...

  7. [iOS翻译]《The Swift Programming Language》系列：Welcome to Swift-01

    注:CocoaChina翻译小组已着手此书及相关资料的翻译,楼主也加入了,多人协作后的完整译本将很快让大家看到. 翻译群:291864979,想加入的同学请进此群哦.(本系列不再更新,但协作翻译的进度 ...

  8. Questions that are independent of programming language. These questions are typically more abstract than other categories.

    Questions that are independent of programming language.  These questions are typically more abstract ...

  9. What is the Best Programming Language to Learn in 2014?

    It’s been a year since I revealed the best languages to learn in 2013. Once again, I’ve examined the ...

  10. C: Answers to “The C programming language, Edition 2”

    <The C programming language> Edition 2的习题答案地址: http://users.powernet.co.uk/eton/kandr2/index.h ...

随机推荐

  1. Java课堂作业

  2. MTCNN学习资源

    MTCNN pytorch版本的实现 TropComplique/mtcnn-pytorch https://github.com/TropComplique/mtcnn-pytorch MTCNN实 ...

  3. 添加SQL字段

    通用式: alter table [表名] add [字段名] 字段属性 default 缺省值 default 是可选参数增加字段: alter table [表名] add 字段名 smallin ...

  4. 基础_String

    String str1="hello"; String str2="hello"; String str3="hello"; String ...

  5. WTForm

    Flask-WTForm: from flask import Flask,render_template,request,redirect from wtforms.fields import co ...

  6. windows服务安装卸载

    到C盘下找到对应的开发VS的installutil.exe文件,复制到程序的执行文件(*.exe)相同目录下在开始程序中找到VS命令提示工具 转到程序的执行文件(*.exe)目录下 C:\>cd ...

  7. 2018CCPC网络赛

    A - Buy and Resell HDU - 6438 The Power Cube is used as a stash of Exotic Power. There are nn cities ...

  8. 【译】从现有的容器里创建新的Docker镜像

    如果你修改了一个容器的内容,你可以使用docker commit命令将现有的容器状态保存为一个镜像. 下面的例子展示了如何修改一个基于oraclelinux:6.6的容器使得其能够运行Apache H ...

  9. mybatis经验

  10. socket实例C语言：一个简单的聊天程序

    我们老师让写一个简单的聊天软件,并且实现不同机子之间的通信,我用的是SOCKET编程.不废话多说了,先附上代码: 服务器端server.c #include <stdio.h> #incl ...