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你真的了解宏吗：浅谈宏定义（#define语句）
本文所有代码均在Linux环境下运行
Linux版本为CentOS 7.4
宏定义
语法
#define name Stuff
#define PI 3.14
//定义一个M，值为3.14
#define DO_FOREVER for(;;)
//定义一个死循环
#define REG register
//定义REG来作为register的别名
#define CASE break;case
//在switch中用CASE来补上break;
#define DEBUG_PRINT printf("file:%s\tline:%d\tdate:%s\ttime:%s\n",\__FILE__, __LINE__, __DATE__, __TIME__);
//测试预定义符号- 1
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1、宏的作用范围
先看下面代码：
让我们查看上图中代码经过预处理后的样子
可以发现宏只对宏定义后的行数起作用，且与定义在哪里无关，即使函数不被调用，也可以使用宏
2、宏替换的原则
在程序中扩展#define定义符号和宏时，需要涉及几个步骤。
1. 在调用宏时，首先对参数进行检查，看看是否包含任何由#define定义的符号。如果是，它们首先被替换。
2. 替换文本随后被插入到程序中原来文本的位置。对于宏，参数名被他们的值替换。
3. 最后，再次对结果文件进行扫描，看看它是否包含任何由#define定义的符号。如果是，就重复上述处理过程。
注意：
1、宏函数不能出现递归
2、宏定义的符号，即name部分不会在预处理替换的时候被搜索
3、宏定义#define后不需要加;
例如：
#define M 100;
这里在100后面加上了;
在句子中有时候就会出现问题
观察下面代码片段：
#define M 100;
if (condition)m = M；
elsemax = 0；- 1
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在该选择语句中会出现语法错误，没有与else与之匹配的if语句
4、宏函数申明
宏函数申明格式：
#define name ( parament-list ) stuff
parament-list为参数表，可以包含多个参数，他们会在stuff出现
例如：
#define SQARE( X ) X*X
//定义一个计算乘方的宏函数- 1
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但是这么定义是会出现预料之外的错误的，观察下面代码片段
#define SQUARE(X) X*Xint main()
{int a = 5;printf("%d\n", SQUARE(a+1));return 0;
}- 1
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本来结果应该为6^2 = 36
但是实际计算机输出的结果为11
我们用gcc观察预处理后的代码片段是怎么样的
使用命令$ gcc -E test.c -o test.i来查看预处理后的代码
可以看到这里原式被替换成 a + 1 * a + 1 = 11，而这个结果显然不是我们期望的
这里我们提出解决方案，将 X 用括号括起来（X），这样就避免上述代码因符号优先级带来的错误
至此，上面代码解决了，来看下面的宏函数定义：
#define DOUBLE(X) (X) + (X)int main()
{int a = 5;printf("%d\n", 10 * DOUBLE(a));return 0;
}- 1
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期望结果为100，而看程序执行结果：
程序再次出现预料之外的结果，原因是原式被替换成了
10 * 5 + 5 = 55
解决方法：
在宏函数定义时，对Stuff中的参数以及结果均用括号来避免因符号运算优先级带来的问题
5、宏中的#和##
#的用法
首先要理解一个原则，即邻近字符串连接原则
在C语言中
printf(“hello”” world!”“\n”);
这句话是合法的
打印结果为：
hello world!
按照上述原则，我们可以写出下列代码:
#define PRINT(FORMAT, VALUE) printf("the value of " #VALUE " is "FORMAT"\n", VALUE)int main()
{int i = 0;PRINT("%d", i + 3);return 0;
}- 1
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看下gcc编译后的代码，程序正常运行：
我们再通过gcc生成test.i文件看下预处理是怎么样的：
所以我们可以看出来#的作用：
将一个宏参数变成一个对应的字符串
在上述例子中：
#VALUE被替换成了“i + 3”
别忘了被替换的时候i + 3两边加上了双引号
##的用法
看下面的代码片段
#define ADD_TO_AN(num, value) a##num += valueint main()
{int a1 = 0;int a2 = 0;ADD_TO_AN(1, 5);ADD_TO_AN(2, 6);return 0;
}- 1
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解释一下上面这段代码
假设有一个变量叫a1
此时代码片段为ADD_TO_AN(1, 5)
即替换为a1 += 5，给a1变量增加5
同理ADD_TO_AN(2, 6)则替换成a2 += 6
##的作用
将##两边的字符连在一起作为一个标识符
前提连接后的标识符必须合法，否则编译出现标识符未定义
6、宏和函数
宏通常被应用于执行简单的运算
和函数相比，宏有他的优点
宏的优点：
1. 用于调用函数和从函数返回的代码可能比实际执行这个小型计算工作所需要的时间更多。所以宏比函数在程序的规模和速度方面更胜一筹
2. 更为重要的是函数的参数必须声明为特定的类型。所以函数只能在类型合适的表达式上使用。反之这个宏怎可以适用于整形、长整型、浮点型等可以用于>来比较的类型。宏的参数与类型无关的
3. 宏参数可以使用变量类型，而函数不可以，例如：
#define MALLOC(num, type) (type *)malloc(num * sizeof(type))MALLOC(10, int);//类型作为参数
//预处理器替换之后：
(int *)malloc(10 * sizeof(int));- 1
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但是，宏参数与类型无关是一把双刃剑，和函数比较也有他的缺点
宏的缺点：
1. 每次使用宏的时候，一份宏定义的代码将插入到程序中。除非宏比较短，否则可能大幅度增加程序的长度
2. 宏是没法调试的
3. 宏由于类型无关，也就不够严谨
4. 宏可能会带来运算符优先级的问题，导致程序容易出现问题
我的建议：
当有一部分功能既可以用函数实现也可以用宏实现，且在调用函数的过程与宏使用过程所消耗的资源相当时，优先考虑代码的严谨性，使用函数
7、宏参数的副作用
当宏参数在宏的定义中出现超过一次的时候，如果参数带有副作用，那么你在使用这个宏的时候就可能出现危险，导致不可预测的后果。副作用就是表达式求值的时候出现的永久性效果。
#define MAX(a, b) ( (a) > (b) ? (a) : (b) )x = 5;
y = 8;
z = MAX(x++, y++);
printf("x=%d y=%d z=%d\n", x, y, z);
//结果为x=6 y=10 z=9- 1
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可以看到上面代码中y++带来了副作用，所以在使用宏的时候，避免使用++运算和--运算
8、宏的命名
宏和函数的使用很类似，我们平时的使用习惯是：
1. 宏名全部大写
2. 函数名不全大写
最后，感谢所有访问我博客的来访者
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详解宏定义（#define）
08-28 98
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格式：
#define 标识符 字符串
其中的标识符就是所谓的符号常量，也称为“宏名”。
预处理（预编译）工作…
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#define A(x) T_##x
#define B（x) #@x
#define C（x) #x
我们假设：x=1，则有：
A(1)…
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最近在阅读代码是发现一个宏定义很奇怪，变对C语言中的宏定义的基本知识进行了简单整理：
普通宏定义
函数宏定义
C语言中宏的调试方法
代码块
下列C代码中包…
来自： zhu4674548的专栏
<div class="recommend-item-box recommend-box-ident type_blog clearfix" data-track-view="{"mod":"popu_614","con":",https://blog.csdn.net/snake_lp/article/details/78698623,BlogCommendFromBaidu_6,index_7"}" data-track-click="{"mod":"popu_614","con":",https://blog.csdn.net/snake_lp/article/details/78698623,BlogCommendFromBaidu_6,index_7"}" data-flg="true"><div class="content" style="width: 842px;"><a href="https://blog.csdn.net/snake_lp/article/details/78698623" target="_blank" title="C语言详解（6）宏定义和条件编译"><h4 class="text-truncate oneline" style="width: 751px;">C语言详解（6）<em>宏定义</em>和条件编译 </h4><div class="info-box d-flex align-content-center"><!-- <p class="avatar"><img src="https://avatar.csdn.net/E/F/D/3_snake_lp.jpg" alt="snake_lp" class="avatar-pic"><span class="namebox"><span class="name">snake_lp</span><span class="triangle"></span></span></p> --><p class="date-and-readNum"><span class="date hover-show">12-02</span><span class="read-num hover-hide"><svg class="icon csdnc-yuedushu" aria-hidden="true"><use xlink:href="#csdnc-m-passwords-visible"></use></svg>1647</span></p></div></a><p class="content" style="width: 842px;"><a href="https://blog.csdn.net/snake_lp/article/details/78698623" target="_blank" title="C语言详解（6）宏定义和条件编译"><span class="desc oneline">宏定义和条件编译
关于C语言详解系列blog的目录：http://blog.csdn.net/snake_lp/article/details/78630717
一、概述
宏定义是…
来自： 程序员的情怀
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aria-hidden="true"><use xlink:href="#csdnc-m-passwords-visible"></use></svg>7126</span></p></div></a><p class="content" style="width: 842px;"><a href="https://blog.csdn.net/swpu_yx32/article/details/52858684" target="_blank" title="C语言带参宏定义"><span class="desc oneline">C语言允许宏带有参数。在宏定义中的参数称为形式参数，在宏调用中的参数称为实际参数，这点和函数有些类似。对带参数的宏，在调用中，不仅要宏展开，而且要用实参去代换形参。带参宏定义的一般形式为：
#de…
来自： swpu_yx32的博客
<div class="recommend-item-box recommend-box-ident type_blog clearfix" data-track-view="{"mod":"popu_614","con":",https://blog.csdn.net/Rston/article/details/51105189,BlogCommendFromBaidu_12,index_12"}" data-track-click="{"mod":"popu_614","con":",https://blog.csdn.net/Rston/article/details/51105189,BlogCommendFromBaidu_12,index_12"}" data-flg="true"><div class="content" style="width: 842px;"><a href="https://blog.csdn.net/Rston/article/details/51105189" target="_blank" title="33.C语言宏定义和预处理"><h4 class="text-truncate oneline" style="width: 752px;">33.C语言<em>宏定义</em>和预处理 </h4><div class="info-box d-flex align-content-center"><!-- <p class="avatar"><img src="https://avatar.csdn.net/7/5/A/3_rston.jpg" alt="Rston" class="avatar-pic"><span class="namebox"><span class="name">Rston</span><span class="triangle"></span></span></p> --><p class="date-and-readNum"><span class="date hover-show">04-09</span><span class="read-num hover-hide"><svg class="icon csdnc-yuedushu" aria-hidden="true"><use xlink:href="#csdnc-m-passwords-visible"></use></svg>2112</span></p></div></a><p class="content" style="width: 842px;"><a href="https://blog.csdn.net/Rston/article/details/51105189" target="_blank" title="33.C语言宏定义和预处理"><span class="desc oneline">33.1.源码到可执行程序过程 33.2.预处理的意义及编程应用 33.3.头文件包含 33.4.注释和条件编译 33.5.宏定义的规则和使用解析 33.6.带参宏和带参函数的区别 33.7.内联函数...</span></a><span class="blog_title_box oneline"><a target="_blank" href="https://blog.csdn.net/Rston">来自： <span class="blog_title"> Rston's Notes</span></a></span></p></div></div><div class="recommend-item-box recommend-ad-box"><div id="kp_box_61" data-pid="61" data-track-view="{"mod":"kp_popu_61-557","con":",,"}" data-track-click="{"mod":"kp_popu_61-557","con":",,"}"><div class="mediav_ad"><newsfeed class="newsfeed QIHOO__WEB__SO__1544527627798_251" id="QIHOO__WEB__SO__1544527627798_251" style="display:block;margin:0;padding:0;border:none;width:852px;height:60px;overflow-y:hidden;overflow-x:hidden;position:relative;text-align:left;"><info-div id="QIHOO__WEB__SO__1544527627798_251-info" style="zoom:1"><info-div class="QIHOO__WEB__SO__1544527627798_251 singleImage clk" data-href="https://s1.milkjpg.com/s?type=2&r=20&mv_ref=blog.csdn.net&enup=CAABPNW/XAgAAly/1TwA&mvid=NTQyODc3MDA5NDE0ODEzMzEwODAwMTg&bid=12c5c462e93bfb3c&price=AAAAAFwPnwsAAAAAAA6MFcFrTLzXquOjeiyBZA==&finfo=DAABCAABAAAAewgAAgAAAFwEAAM/VL9XU33nQAAIAAIAAAADCgADgMk2IHBnptwIAAQAAABhBgAGLbcIAAgAEsSwCgAJAAAAAAACEBgGAAoAAAA&ugi=FcTgigEVyNtrTBUCFY4EFaYEFQAAFfPvla0PFkQVyAEA&uai=FaixkwIlAhUEFu+myqepgaaT/gEV8ggl9r6ZzgclABUaAA&ubi=FbqJSxXgl7kCFeaR5RYVhomaVxUEFRwWuIu4hhcW76a9vO335Lb+ATQCFrDAkIAIJQYVgMnjxwgVvgUVADaQ1ZO3pfO2kOcBAA&clickid=0&cpx=__OFFSET_X__&cpy=__OFFSET_Y__&cs=__EVENT_TIME_START__&ce=__EVENT_TIME_END__&csign=e4b646e76c43e63e&csign2=USrScr0V2cI=&url=http%3A%2F%2F313.yiikaa.cn%2F" data-pv="https://s1.milkjpg.com/s?type=1&r=20&tid=NTQyODc3MDA5NDE0ODEzMzEwODAwMTg&finfo=DAABCAABAAAAewgAAgAAAFwEAAM/VL9XU33nQAAIAAIAAAADCgADgMk2IHBnptwIAAQAAABhBgAGLbcIAAgAEsSwCgAJAAAAAAACEBgGAAoAAAA&mv_ref=blog.csdn.net&enup=CAABPNW/XAgAAly/1TwA&mvid=NTQyODc3MDA5NDE0ODEzMzEwODAwMTg&bid=12c5c462e93bfb3c&ugi=FcTgigEVyNtrTBUCFY4EFaYEFQAAFfPvla0PFkQVyAEA&uai=FaixkwIlAhUEFu+myqepgaaT/gEV8ggl9r6ZzgclABUaAA&ubi=FbqJSxXgl7kCFeaR5RYVhomaVxUEFRwWuIu4hhcW76a9vO335Lb+ATQCFrDAkIAIJQYVgMnjxwgVvgUVADaQ1ZO3pfO2kOcBAA&ds=1&price=AAAAAFwPnwsAAAAAAA6MFcFrTLzXquOjeiyBZA==,https://max-l.mediav.com/rtb?type=2&d=100&b=12c5c462e93bfb3c&p=2255956&l=1136674&s=1&z=1&w=AAAAAFwPnwsAAAAAAA6MO5X6a+hj8HFwlIv8pw==&k=7WSkvQAAAAA=&i=3J3JDaN-DA4B&v=54287700941481331080018" data-clk="https://max-l.mediav.com/rtb?type=3&d=100&b=12c5c462e93bfb3c&p=2255956&l=1136674&s=1&k=7WSkvQAAAAA=&i=3J3JDaN-DA4B&v=54287700941481331080018&x=__OFFSET_X__&y=__OFFSET_Y__&st=__EVENT_TIME_START__&et=__EVENT_TIME_END__&tc=&turl=">
<info-div class="wrap"><info-div class="singleImage-img singleImage-img-left"><info-div class="img" style="background-image:url(https://s3m.mediav.com/galileo/615005-fa36a3932aedc0f8bba3c5456a1403f4.gif)"><info-div class="ads-tag"></info-div></info-div></info-div><info-div class="singleImage-body singleImage-body-left"><info-div class="singleImage-title">新推出的赚钱方法， 原来是这样赚到钱的！</info-div><info-div class="singleImage-desc">建木投资 · 燨燚</info-div></info-div>
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预定义符号
#include
#include
#define DEBUG_PRINT()
printf("file:%s lin…
来自： 微风
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作用：将宏定义的多个形参转换为一个实际参数名。
例：#define fun(n) num##n
fun(1) 代表num1 可用来定义或使用多个变…
来自： ajuse的博客
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typedef unsigned char uint8; typedef signed short int int16; typedef </p></a></div><div class="recommend-item-box recommend-box-ident type_blog clearfix" data-track-view="{"mod":"popu_614","con":",https://blog.csdn.net/jokerWRN/article/details/79641038,searchFromBaidu_17,index_17"}" data-track-click="{"mod":"popu_614","con":",https://blog.csdn.net/jokerWRN/article/details/79641038,searchFromBaidu_17,index_17"}" data-flg="true"><div class="content" style="width: 842px;"><a href="https://blog.csdn.net/jokerWRN/article/details/79641038" target="_blank" title="宏定义与宏语言"><h4 class="text-truncate oneline" style="width: 759px;"><em>宏定义</em>与宏语言 </h4><div class="info-box d-flex align-content-center"><!-- <p class="avatar"><img src="https://avatar.csdn.net/3/3/9/3_jokerwrn.jpg" alt="jokerWRN" class="avatar-pic"><span class="namebox"><span class="name">jokerWRN</span><span class="triangle"></span></span></p> --><p class="date-and-readNum"><span class="date hover-show">03-21</span><span class="read-num hover-hide"><svg class="icon csdnc-yuedushu" aria-hidden="true"><use xlink:href="#csdnc-m-passwords-visible"></use></svg>317</span></p></div></a><p class="content" style="width: 842px;"><a href="https://blog.csdn.net/jokerWRN/article/details/79641038" target="_blank" title="宏定义与宏语言"><span class="desc oneline">都是个人的理解，不保证正确，欢迎交流宏语言：常运用于文本编辑软件的一种编程语言，简单来说就是：宏语言是一种编程语言。宏定义：使用#define来实现对文本的替换。详情见typedef和#define的...</span></a><span class="blog_title_box oneline"><a target="_blank" href="https://blog.csdn.net/jokerWRN">来自： <span class="blog_title"> jokerWRN的博客</span></a></span></p></div></div><div class="recommend-item-box recommend-ad-box"><div id="kp_box_62" data-pid="62" data-track-view="{"mod":"kp_popu_62-556","con":",,"}" data-track-click="{"mod":"kp_popu_62-556","con":",,"}"><div class="mediav_ad"><newsfeed class="newsfeed QIHOO__WEB__SO__1544527628103_362" id="QIHOO__WEB__SO__1544527628103_362" style="display:block;margin:0;padding:0;border:none;width:852px;height:60px;overflow-y:hidden;overflow-x:hidden;position:relative;text-align:left;"><info-div id="QIHOO__WEB__SO__1544527628103_362-info" style="zoom:1"><info-div class="QIHOO__WEB__SO__1544527628103_362 singleImage clk" data-href="https://s1.milkjpg.com/s?type=2&r=20&mv_ref=blog.csdn.net&enup=CAABPNW/XAgAAly/1TwA&mvid=NTQyODc3MDA5NDE0ODEzMzEwODAwMTg&bid=12c5c462c4093734&price=AAAAAFwPnwsAAAAAAA2D9wRIFUxAWa8kET18JQ==&finfo=DAABCAABAAAAfggAAgAAAGoEAAM/Uzxk3a78aQAIAAIAAAADCgADfFJNrm36vqoIAAQAAABrBgAGLbcIAAgAEzngCgAJAAAAAAACEBQGAAoAAAA&ugi=FcTgigEVyNtrTBUCFY4EFaYEFQAAFfPvla0PFgQVyAEA&uai=FeTGlAIlAhUEFpDZpvG8353S+AEV8gglmb7XjgolABUaAA&ubi=FbilSxXK27oCFZza7RYVwKasVxUEFSIWiK/thhcWkNnQv9DrptL4ATQEFqjAkIAIJQYVgJWGqw8VvgUVADaE076N9Pv2yIgBAA&clickid=0&cpx=__OFFSET_X__&cpy=__OFFSET_Y__&cs=__EVENT_TIME_START__&ce=__EVENT_TIME_END__&csign=008f6a735fb51ab5&csign2=hAyzMkHI7Nd=&url=http%3A%2F%2F619.fadoers.cn%2F" data-pv="https://s1.milkjpg.com/s?type=1&r=20&tid=NTQyODc3MDA5NDE0ODEzMzEwODAwMTg&finfo=DAABCAABAAAAfggAAgAAAGoEAAM/Uzxk3a78aQAIAAIAAAADCgADfFJNrm36vqoIAAQAAABrBgAGLbcIAAgAEzngCgAJAAAAAAACEBQGAAoAAAA&mv_ref=blog.csdn.net&enup=CAABPNW/XAgAAly/1TwA&mvid=NTQyODc3MDA5NDE0ODEzMzEwODAwMTg&bid=12c5c462c4093734&ugi=FcTgigEVyNtrTBUCFY4EFaYEFQAAFfPvla0PFgQVyAEA&uai=FeTGlAIlAhUEFpDZpvG8353S+AEV8gglmb7XjgolABUaAA&ubi=FbilSxXK27oCFZza7RYVwKasVxUEFSIWiK/thhcWkNnQv9DrptL4ATQEFqjAkIAIJQYVgJWGqw8VvgUVADaE076N9Pv2yIgBAA&ds=2&price=AAAAAFwPnwsAAAAAAA2D9wRIFUxAWa8kET18JQ==,https://max-l.mediav.com/rtb?type=2&d=100&b=12c5c462c4093734&p=2265522&l=1136674&s=2&z=1&w=AAAAAFwPnwsAAAAAAA2EFHGpJ/lGonSPPz4owA==&k=1J6ZVAAAAAA=&i=hJOPvaN-DA4B&v=54287700941481331080018" data-clk="https://max-l.mediav.com/rtb?type=3&d=100&b=12c5c462c4093734&p=2265522&l=1136674&s=2&k=1J6ZVAAAAAA=&i=hJOPvaN-DA4B&v=54287700941481331080018&x=__OFFSET_X__&y=__OFFSET_Y__&st=__EVENT_TIME_START__&et=__EVENT_TIME_END__&tc=&turl=">
<info-div class="wrap"><info-div class="singleImage-img singleImage-img-left"><info-div class="img" style="background-image:url(https://s3m.mediav.com/galileo/616796-a3b61802d980cbb04734fd58367f16a0.jpg)"><info-div class="ads-tag"></info-div></info-div></info-div><info-div class="singleImage-body singleImage-body-left"><info-div class="singleImage-title">辛辛苦苦一整年，存折始终没有钱，你还想这样生活吗</info-div><info-div class="singleImage-desc">义昂投资 · 燨燚</info-div></info-div>
<div class="recommend-item-box recommend-box-ident type_blog clearfix" data-track-view="{"mod":"popu_614","con":",https://blog.csdn.net/imgosty/article/details/81901183,searchFromBaidu_18,index_18"}" data-track-click="{"mod":"popu_614","con":",https://blog.csdn.net/imgosty/article/details/81901183,searchFromBaidu_18,index_18"}" data-flg="true"><div class="content" style="width: 842px;"><a href="https://blog.csdn.net/imgosty/article/details/81901183" target="_blank" title="C语言中宏定义的使用"><h4 class="text-truncate oneline" style="width: 759px;">C语言中<em>宏定义</em>的使用 </h4><div class="info-box d-flex align-content-center"><!-- <p class="avatar"><img src="https://avatar.csdn.net/0/E/E/3_imgosty.jpg" alt="imgosty" class="avatar-pic"><span class="namebox"><span class="name">imgosty</span><span class="triangle"></span></span></p> --><p class="date-and-readNum"><span class="date hover-show">08-21</span><span class="read-num hover-hide"><svg class="icon csdnc-yuedushu" aria-hidden="true"><use xlink:href="#csdnc-m-passwords-visible"></use></svg>485</span></p></div></a><p class="content" style="width: 842px;"><a href="https://blog.csdn.net/imgosty/article/details/81901183" target="_blank" title="C语言中宏定义的使用"><span class="desc oneline">
- 引言
1.1 宏定义的基本语法
1.2 宏定义的优点
1.3 宏定义的缺点
1.4 宏还是函数
2 使用宏时的注意点
2.1 算符优先级问题
2.2 分号吞噬问题
2.3 宏参数重复调…
来自： imgosty的博客
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首先，函数…
来自： shaodongju的博客
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2: #define CHAR_A ‘a’
3: #define STRING_A “a”
…
来自： 寂竹
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- 文件包含
- 条件编译
伪指令（或预处理指令）定义：
预处理指令是以#号开头的代码行。#号必须是该行除了任何空白字符外的第一个字符。#后是指令关键字，在关键字和#号之间允许存…
来自： 行者小朱的博客
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#include
#define SIZE 20;
double superNumber(double a, double b)//…
来自： sinat_30415255的博客
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C语言中用到宏定义的地方很多，如在头文件中为了防止头文件被…
来自： biqioso的博客
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一：按位与（就是0x1
define max(a,b) (((long)(a-b)) & 0x80000000)?b:a
二：//有…
来自： 朱铭德的博客
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{
int c …
来自： fendoubasaonian的专栏
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#include
#define f(a,b) a##b
#define g(a) #a
#define h(a) g(a)
…
来自： leolian
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#define
f(a,b) a##b
#define g(a) #a
#define h(a) g(a)
#
将右边的参数做整体的字符串替换，即便是另一个宏，也不展…
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1
#ifdef MMI_BOOTUP_SCALE
#define MMI_APP_INIT(func) {U32 start_time…
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1、# （stringizing）字符串化操作符。
其作用是…
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#define IS_IPAD [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomP…
来自： 都丰GZH的博客
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另外还有一个问题需要引起注意，看下面例子：
#define SUM （x） （x）+（x）
复制代码
这还是定义的宏函数SUM（x）吗？显然…
来自： liupycsdn的博客
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#define MAX_NUM x //x为参数
#define MAX_NUM ( x ) //宏的参数可以…
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引言C语言允许宏带有参数。在宏定义中的参数称为形式参数，在宏调用中的参数称为实际参数，这种宏外形和作用与函数类似，即类函数宏。但是它的行为和函数调用完全不同。对带参数的宏，在…
来自： Brian的博客
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在c/c++程…
来自： 我了个去
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来自： 大杂烩
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基础 CUP 挖矿教程
如何挖矿？
Step1:获得一个钱包地址
钱包分为两个部分讲,一个是在线钱包,一个是本地钱包.(按需选择)
1.在线钱包
在 XMR …
来自： qq_39863517的博客
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来自： 愤怒的懒洋洋的博客
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本文出自方志朋的博客
错过了这一篇，你可能再也学不会 Sp…
来自： 方志朋的专栏
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方法一：（更新时间：2018/4/8）v3.3
注册时，在打开的Lice…
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温馨提示：本教程的 GitHub 地址为「intellij-idea-tutorial」，欢迎感兴趣的童鞋Star、Fork，纠错。
IntelliJ IDEA 注册码
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来自： 维C果糖的博客
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因公司的需求，需要做一个爬取最近上映的电影、列车号、航班号、机场、车站等信息，所以需要我做一个爬虫…
来自： 昌昌
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现在越来越流行在线看视频了，但是对于我得收藏癖爱好者，还是希望可以有比较好的资源网站的，尤其是种子、磁力链网站。所以就整理了一份干净、好用的TOP10出来：
先推荐一个下载磁力链的工具：
马…
来自： YXAPP的技术分享
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集中式架构 → 垂直拆分→ 分布式 → (服务治理) → 微…
来自： 熊局长的博客
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来自： 欢迎来到☆槿畔☆的博客
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安装完成，打开Webstorm，在弹出的License Activation窗口中选择“License server”，在输入框输入下面的网址：
htt…
来自： 老妖儿的博客
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1． 什么是mock.js?
Mock.js （官网http://mockjs.com/）是一款模拟数据生成器，旨在帮助前端攻城狮独立
于后端进行开发，帮助编写单元测试。提供了…
来自： Armymans的博客
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一、前言
MyBatis 是一款优秀的持久层框架，它支持定制化 SQL、存储过程以及高级映射。MyBatis 避免了几乎所有的 JDBC 代码和手动设置…
来自： 愤怒的懒洋洋的博客
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Sql是最重要的关系数据库操作语言，现在基本上任何与数据库相关的操作都离不开sql。所以说sql功能是很强大的。
但是Sql对表的操作…
来自： 愤怒的懒洋洋的博客
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1.1.认识Eureka
Eureka做什么？
Eureka就好比是滴滴，负责管理、记录服务提供者的信息。服务调用者无需自己寻找服务，而是把自己的需求告诉Eureka，然…
来自： Armymans的博客
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一、前言
Sql是最重要的关系数据库操作语言，现在基本上任何与数据库相关的操作都离不开sql。所以说sql功能是很强大的。
我们常用的sql关键字不外乎 group by…
来自： 愤怒的懒洋洋的博客
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1
【单选题】我国陆地领土面积排名世界第几？（C）
A、1
B、2
C、3
D、4
2
【单选题】以下哪个国家不属于金砖五国（BRICS）？（B）
A、中国
B、日本
C…
来自： ling_wang的博客
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问题总结：
在Windows平台下如果PHP使用的是IIS的话那么php在上传文件时是先将文件上传到一个临时目录下的
…
来自： psw的博客
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第一次用vs来搞lua的项目，所以搭建环境比较麻烦，在网上找了好久，但是却没有找到一个靠谱的，摸索了好久，在这里记录下我的心得吧。
1.首先新建一个cocos2…
来自： pyf_914406232的博客
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*创建型模式（4种）：工厂方模式，单例模式，建造者模式，原型模式
*结构型模式（7种）：适配器模式，装饰器模式，代理模式，外观模式，桥接模式，组合模式，享元模式
…
来自： Armymans的博客
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距离拿到offer已半月有余，闲来无事，回忆一下去面杭研海思数字芯片的经过，顺便给后来者提供借鉴，希望你们能从我的经历中得到…
来自： weixin_43343190的博客
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2.非关系型数据库通常指数据以对象的形式存储在数据库中，而对象之间的关系…
来自： Armymans的博客
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本文由@唐三十胖子出品，转载请注明出处。 文章链接：https://blog.csdn.net/iceSony/article/details/84667194
…
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百度网盘不限速 点击下载 提取码：jsk0
对于大多数人来说，每次在百度网盘下载东西的时候总会被限速，如果不想被限速就要充值百度网盘的SVIP，…
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1.创建一个目录/data
mkdir /data或者cd /;mkdir data
2.在data目录下创建一个test.txt
touch /data/test.t…
来自： 唐三十胖子的博客
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近日恰逢双十一，瞅了瞅自己干瘪的钱包，没忍心入手期待已久的 macPro，只好在虚拟机里玩一下 mac好了，等以后钱包傲气的时候再来个真实的。
安装环境：
windows10 VM…
来自： u011415782的专栏
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</main>
欢迎使用Markdown编辑器
你好！ 这是你第一次使用 Markdown编辑器 所展示的欢迎页。如果你想学习如何使用Markdown编辑器, 可以仔细阅读这篇文章，了解一下Markdown的基本语法知识。
新的改变
我们对Markdown编辑器进行了一些功能拓展与语法支持，除了标准的Markdown编辑器功能，我们增加了如下几点新功能，帮助你用它写博客：
- 全新的界面设计 ，将会带来全新的写作体验；
- 在创作中心设置你喜爱的代码高亮样式，Markdown 将代码片显示选择的高亮样式 进行展示；
- 增加了 图片拖拽 功能，你可以将本地的图片直接拖拽到编辑区域直接展示；
- 全新的 KaTeX数学公式 语法；
- 增加了支持甘特图的mermaid语法1 功能；
- 增加了 多屏幕编辑 Markdown文章功能；
- 增加了 焦点写作模式、预览模式、简洁写作模式、左右区域同步滚轮设置 等功能，功能按钮位于编辑区域与预览区域中间；
- 增加了 检查列表 功能。
功能快捷键
撤销：Ctrl/Command + Z
重做：Ctrl/Command + Y
加粗：Ctrl/Command + B
斜体：Ctrl/Command + I
标题：Ctrl/Command + Shift + H
无序列表：Ctrl/Command + Shift + U
有序列表：Ctrl/Command + Shift + O
检查列表：Ctrl/Command + Shift + C
插入代码：Ctrl/Command + Shift + K
插入链接：Ctrl/Command + Shift + L
插入图片：Ctrl/Command + Shift + G
合理的创建标题，有助于目录的生成
直接输入1次#，并按下space后，将生成1级标题。
输入2次#，并按下space后，将生成2级标题。
以此类推，我们支持6级标题。有助于使用TOC语法后生成一个完美的目录。
如何改变文本的样式
强调文本 强调文本
加粗文本 加粗文本
标记文本
删除文本
引用文本
H2O is是液体。
210 运算结果是 1024.
插入链接与图片
链接: link.
图片: 
带尺寸的图片:
当然，我们为了让用户更加便捷，我们增加了图片拖拽功能。
如何插入一段漂亮的代码片
去博客设置页面，选择一款你喜欢的代码片高亮样式，下面展示同样高亮的 代码片.
// An highlighted block
var foo = 'bar';
生成一个适合你的列表
- 项目
- 项目
- 项目
- 项目
- 项目1
- 项目2
- 项目3
- 计划任务
- 完成任务
创建一个表格
一个简单的表格是这么创建的：
| 项目 | Value |
|---|---|
| 电脑 | $1600 |
| 手机 | $12 |
| 导管 | $1 |
设定内容居中、居左、居右
使用:---------:居中
使用:----------居左
使用----------:居右
| 第一列 | 第二列 | 第三列 |
|---|---|---|
| 第一列文本居中 | 第二列文本居右 | 第三列文本居左 |
SmartyPants
SmartyPants将ASCII标点字符转换为“智能”印刷标点HTML实体。例如：
| TYPE | ASCII | HTML |
|---|---|---|
| Single backticks | 'Isn't this fun?' | ‘Isn’t this fun?’ |
| Quotes | "Isn't this fun?" | “Isn’t this fun?” |
| Dashes | -- is en-dash, --- is em-dash | – is en-dash, — is em-dash |
创建一个自定义列表
- Markdown
- Text-to- HTML conversion tool Authors
- John
- Luke
如何创建一个注脚
一个具有注脚的文本。2
注释也是必不可少的
Markdown将文本转换为 HTML。
KaTeX数学公式
您可以使用渲染LaTeX数学表达式 KaTeX:
Gamma公式展示 Γ ( n ) = ( n − 1 ) ! ∀ n ∈ N \Gamma(n) = (n-1)!\quad\forall n\in\mathbb N Γ(n)=(n−1)!∀n∈N 是通过欧拉积分
Γ ( z ) = ∫ 0 ∞ t z − 1 e − t d t   . \Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,. Γ(z)=∫0∞tz−1e−tdt.
你可以找到更多关于的信息 LaTeX 数学表达式here.
新的甘特图功能，丰富你的文章
- 关于 甘特图 语法，参考 这儿,
UML 图表
可以使用UML图表进行渲染。 Mermaid. 例如下面产生的一个序列图：:
这将产生一个流程图。:
- 关于 Mermaid 语法，参考 这儿,
FLowchart流程图
我们依旧会支持flowchart的流程图：
- 关于 Flowchart流程图 语法，参考 这儿.
导出与导入
导出
如果你想尝试使用此编辑器, 你可以在此篇文章任意编辑。当你完成了一篇文章的写作, 在上方工具栏找到 文章导出 ，生成一个.md文件或者.html文件进行本地保存。
导入
如果你想加载一篇你写过的.md文件或者.html文件，在上方工具栏可以选择导入功能进行对应扩展名的文件导入，
继续你的创作。
mermaid语法说明 ↩︎
注脚的解释 ↩︎
