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This article introduces the relevant knowledge of "what is the basic concept of c language function". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The basic concept of function

The "function" in programming is translated from the English "function". In its sense, the function has the meaning of function, that is to say, the purpose of defining a function in the program is to let it complete a certain function, and this function will be used many times in the program. Usually, when programming a complex problem, the decomposition method is used to decompose the problem into several relatively independent sub-problems, each of which corresponds to a functional module of the program. In C language, functions are used to define these functional modules, and these functions are used by calling corresponding functions.

The following explains the concept and function of C language functions:

(1) A function is a program unit that completes a specific function according to the format prescribed by the C language.

(2) one or more functions can be defined in a source program file. Note: C language programs are compiled in terms of source files, not functions.

(3) A C program consists of one or more source program files. When the scale of the program is large, it can be divided into multiple source program files for easy editing, debugging and compilation. A source program file can be reused by multiple C language programs.

(4) there can be only one main function in a C program. The program starts from the main function, and other functions can be called in the main function. After the execution of the called function is completed, the program flow returns the main function, and the main function ends the operation of the program.

(5) all functions defined in the program are parallel. C language does not allow the nested definition of functions, that is, each function is independent of each other, and there is no dependency between functions. Functions can be called to each other, but not the main function.

(6) from the point of view of users, functions are divided into "library functions" and "custom functions". Provided by the system

The function called directly by the user is called the library function, and the function defined and called by the user in the program is called the custom function.

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