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Xiao Gao shared (28) functions in the C language
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Xiao Gao shares (28) Functions in C language
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1. The concept of functions
1. The concept of function
In C, a function is a piece of code that can be reused to perform a specific task. Functions can improve the readability, maintainability, and reusability of your code. The definition of a function includes the function name, the return value type, the parameter list, and the function body. By defining functions, we can decompose complex tasks into several simple tasks, thus reducing the difficulty of program design.
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. The role of functions
2. Function function
(1) Improve 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 code readability.
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) Reduce the degree of code coupling: Functions can encapsulate specific functions inside the function, reduce the coupling degree between different functions, and reduce the mutual influence between each function. When a function is modified, it has less impact on other functions, which is convenient for maintenance and upgrade.
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) Improve code reusability: Functions have independent functions that can be reused in other projects. Developers can focus on developing function-specific functions and then integrate them into other projects when needed, improving code reusability.
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. Classification of functions
3. Classification of functions
(1) Library functions: Library functions are a set of predefined functions provided by the C language, such as those declared in header files such as stdio.h and stdlib.h. These functions provide developers with a range of common functions, such as input and output, memory management, and more.
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) Custom functions: Custom functions are functions written by developers according to actual needs. With custom functions, developers can encapsulate specific functions inside the function, improving the readability, maintainability, and reusability of the code.
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. How to define and call functions
4. How to define and call functions
(1) Define a function: A defined function includes a specified function name, return value type, parameter list, and function body. Function names should be descriptive and easy to understand. The return value type specifies the type of result that will be returned after the function is executed. The list of parameters is used to specify the external data that the function receives. Function bodies include code that performs a specific task.
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) Invoking a function: Invoking a function refers to the use of a defined function in other functions or in the main function. When you call a function, you need to provide a corresponding number of parameters, and the parameter type must be the same as the parameter type in the function definition. After the function is called, the program will jump to the function body of the called function to execute the corresponding task, and return to the calling function after the execution is complete.
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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Part of the content is referenced from bilibili, Baidu
Translation source: Tongyi Qianwen