wps宏的功能_宏与功能之间的区别

快来打我* 2022-12-07 13:26 143阅读 0赞

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wps宏的功能

In this post, we are going to understand difference between macro and function. But before getting started, I want to explain little bit about macro and function to you in an easy way.

在本文中，我们将了解宏和函数之间的区别。 但是在开始之前，我想向您简单介绍一些宏和功能。

**What is a function?**

**什么是功能？**

A function can be stated as a group of statements that performs some kind of task. In every C program, you’ll notice at least one function that is **main()** function. The execution of the program starts from there only. You can divide your code into smaller functions for reducing the size of the body of **main()** function.

可以将函数声明为执行某种任务的一组语句。 在每个C程序中，您都会注意到至少一个函数是**main()**函数。 程序仅从此处开始执行。 您可以将代码分成较小的函数，以减小**main()**函数主体的大小。

Now let us see the syntax of a function.

现在让我们看一下函数的语法。

return_type function_name(parameter){
        //body of the function
    }

**What is a macro?**

**什么是宏？**

Macros are used to define symbolic constants. It is a preprocessor directive, which means it replaces itself with the value which is given to it. Let us understand it with an example.

宏用于定义符号常量。 这是一个预处理程序指令，这意味着它将用为其赋予的值替换自身。 让我们通过一个例子来理解它。

#include <stdio.h>
    #define X 3     //macro definition
     
    int main(){
        int x = 10;
        printf("%d\n", x + X);    //here the value of 'X' gets replaced by '3' 
    }

The output of the above code is:

上面代码的输出是：

Hope you’ve got an idea of macro and its use.

希望您对宏及其用法有所了解。

## 宏与功能之间的区别 **(**Difference between Macro and Function**)** ##

<table> 
 <tbody> 
  <tr> 
   <td><strong>Macro</strong></td> 
   <td><strong>Function</strong></td> 
  </tr> 
  <tr> 
   <td>It is not compiled, it is pre-processed.</td> 
   <td>It is not pre-processed but it is compiled.</td> 
  </tr> 
  <tr> 
   <td>Macros do not check for compilation error which leads to unexpected output.</td> 
   <td>Function checks for compilation error and there is a less chance of unexpected output.</td> 
  </tr> 
  <tr> 
   <td>Code length is increased.</td> 
   <td>Code length remains same.</td> 
  </tr> 
  <tr> 
   <td>Macros are faster in execution than function.</td> 
   <td>Functions are bit slower in execution.</td> 
  </tr> 
  <tr> 
   <td>Before compilation process the macro name is replaced by the macro value.</td> 
   <td>In&nbsp;a function call, transfer of control takes place.</td> 
  </tr> 
  <tr> 
   <td>Macros are useful&nbsp;when a small piece of code used multiple times in a program.</td> 
   <td>Functions&nbsp;are helpful when a large piece of code repeated number of times.</td> 
  </tr> 
 </tbody> 
</table>

<table> 
 <tbody> 
  <tr> 
   <td> <strong>巨集</strong> </td> 
   <td> <strong>功能</strong> </td> 
  </tr> 
  <tr> 
   <td> 它没有编译，而是经过预处理的。 </td> 
   <td> 它未经预处理，但已编译。 </td> 
  </tr> 
  <tr> 
   <td> 宏不检查编译错误，这会导致意外输出。 </td> 
   <td> 函数检查编译错误，并减少意外输出的机会。 </td> 
  </tr> 
  <tr> 
   <td> 代码长度增加。 </td> 
   <td> 代码长度保持不变。 </td> 
  </tr> 
  <tr> 
   <td> 宏在执行方面比函数要快。 </td> 
   <td> 函数的执行速度较慢。 </td> 
  </tr> 
  <tr> 
   <td> 在编译过程之前，宏名称将替换为宏值。 </td> 
   <td> 在函数调用中，发生控制转移。 </td> 
  </tr> 
  <tr> 
   <td> 当一小段代码在程序中多次使用时，宏很有用。 </td> 
   <td> 当一大段代码重复多次时，函数很有用。 </td> 
  </tr> 
 </tbody> 
</table>

Comment below if you have queries regarding above tutorial for difference between macro and function.

如果您对以上教程有疑问，请参见下面的注释，以了解宏和函数之间的区别。

> 翻译自: [https://www.thecrazyprogrammer.com/2018/03/difference-between-macro-and-function.html][https_www.thecrazyprogrammer.com_2018_03_difference-between-macro-and-function.html]

wps宏的功能

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[https_www.thecrazyprogrammer.com_2018_03_difference-between-macro-and-function.html]: https://www.thecrazyprogrammer.com/2018/03/difference-between-macro-and-function.html