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This article is about how the C program is structured. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

C program is composed of functions, is composed of a main function and several other functions. Function is the basic unit of C program. The function called can be a library function provided by the system or a function defined by the user according to his needs.

Operating environment for this tutorial: Windows 7 system, c99 version, Dell G3 computer.

C source code is composed of functions. Function is the basic unit of C program. The function called can be a library function provided by the system or a function defined by the user according to his needs.

A C program consists of a main function and several other functions.

The main function, also known as the main function, is the starting point of program execution and the entry function of C program, that is, the execution of the program starts from the main function, and the transfer of other functions is directly or indirectly called in the main function.

A C program has one and only one main function, and may have several other functions besides main, each of which performs a particular operation.

Program execution always starts with the main function, and if there are other functions, it returns to the main function after completing the calls to other functions, and finally ends the program with the main function. The main function is called by the system while the program is executing. The main function is called after initialization of a non-local object with static storage duration is completed at program startup. It is the entry point specified by the program in a hosted environment (i.e., an operating system). Entry points for standalone programs (boot loader, operating system kernel, etc.) are implementation-defined.

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