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小高分享（28）C语言中的函数
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Xiao Gao shares (28) Functions in C language
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1. 函数的概念
1. The concept of function
在C语言中，函数是一段可以重复使用的代码，用于执行特定任务。函数可以提高代码的可读性、可维护性和可重用性。函数的定义包括函数名、返回值类型、参数列表和函数体。通过定义函数，我们可以将复杂的任务分解为若干个简单的任务，从而降低程序设计的难度。
In C, a function is a piece of code that can be reused to perform a specific task. Functions can improve code readability, maintainability, and reusability. The definition of a function includes the function name, return value type, argument list, and function body. By defining functions, we can decompose a complex task into several simple tasks, thus reducing the difficulty of programming.
2. 函数的作用
2. Function function
①提高代码可读性：函数可以将复杂的任务分解为若干个简单的任务，使得程序结构清晰，易于理解。开发者可以快速找到相关代码，提高代码的可读性。
①Improve code readability: functions can decompose complex tasks into several simple tasks, making the program structure clear and easy to understand. Developers can quickly find relevant code and improve the readability of code.
②降低代码耦合度：函数可以将具体的功能封装在函数内部，降低不同函数之间的耦合度，使得各个函数之间的相互影响减小。当某个函数发生修改时，对其他函数的影响较小，便于维护和升级。
②Reduce the coupling degree of code: the function can encapsulate the specific function inside the function, reduce the coupling degree between different functions, so that the mutual influence between various functions is reduced. When a function is modified, it has little impact on other functions and facilitates maintenance and upgrade.
③提高代码可重用性：函数具有独立的功能，可以在其他项目中重用。开发者可以专注于开发特定功能的函数，然后在需要时将其集成到其他项目中，提高代码的可重用性。
③Improve code reusability: Functions have independent functions that can be reused in other projects. Developers can focus on developing functions for specific functions and then integrate them into other projects when needed, improving code reusability.
3. 函数的分类
3. Classification of functions
①库函数：库函数是C语言提供的一组预定义函数，如stdio.h、stdlib.h等头文件中声明的函数。这些函数为开发者提供了一系列常用功能，如输入输出、内存管理等。
①Library functions: Library functions are a set of predefined functions provided by the C language, such as the functions declared in the stdio.h, stdlib.h and other header files. These functions provide developers with a range of common functions, such as input/output, memory management, and so on.
②自定义函数：自定义函数是开发者根据实际需求编写的函数。通过自定义函数，开发者可以将特定的功能封装在函数内部，提高代码的可读性、可维护性和可重用性。
② Custom function: Custom function is a function written by the developer according to the actual needs. By customizing functions, developers can encapsulate specific functionality inside functions, improving code readability, maintainability, and reusability.
4. 如何定义和调用函数
4. How to define and call functions
①定义函数：定义函数包括指定函数名、返回值类型、参数列表和函数体。函数名应具有描述性，易于理解。返回值类型用于指定函数执行完毕后返回的结果类型。参数列表用于指定函数接收的外部数据。函数体包括执行特定任务的代码。
Defining a function: Defining a function includes specifying a function name, return value type, parameter list, and function body. Function names should be descriptive and easy to understand. Return value type Specifies the type of the result to be returned after the function has completed execution. The parameter list is used to specify the external data that the function receives. The body of a function contains code that performs a specific task.
②调用函数：调用函数是指在其他函数或主函数中使用已定义的函数。调用函数时，需要提供相应数量的参数，参数类型应与函数定义中的参数类型一致。调用函数后，程序会跳转到被调用函数的函数体执行相应任务，执行完毕后返回调用函数。
②Call function: Call function refers to the use of defined functions in other functions or main functions. When calling a function, you need to provide a corresponding number of parameters, and the parameter types should be the same as those in the function definition. After calling the function, the program will jump to the function body of the called function to perform the corresponding task, and return to the calling function after execution.
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部分内容参考于bilibili，百度
翻译来源：通义千问