What does a C language program consist of?

A C language program is composed of a main function and several other functions. Function is the basic unit of C language program. There is only one main() function in a C language program. In addition to the main function, there can be several other functions. Each function implements a specific operation. A function is a piece of code that can be reused to complete a certain function independently. It can receive data passed by the user or not.

The operating environment of this tutorial: windows7 system, c99 version, Dell G3 computer.

A C language program is composed of a main function and several other functions. The function is the basic unit of the C program. There is only one main() function in a C language program. In addition to the main function, there are There are several other functions, each performing a specific operation.

In a C language program, the called function can be a library function provided by the system, or a function defined by the user according to their needs.

A function is a piece of code that can be reused to complete a certain function independently. It can receive data passed by the user or not. Functions that receive user data must specify parameters when defining them. Functions that do not receive user data do not need to be specified. Based on this, functions can be divided into parameterized functions and parameterless functions.

The process of encapsulating a code segment into a function is called function definition.

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C language is a process-oriented, abstract, general-purpose programming language that is widely used in low-level development. C language can compile and process low-level memory in a simple way. C language is an efficient programming language that only generates a small amount of machine language and can run without any operating environment support. Although the C language provides many low-level processing functions, it still maintains cross-platform characteristics. C language programs written in a standard specification can be executed on many computer platforms including operating platforms such as embedded processors and supercomputers. Compile.

C language is the most universal computer programming language. It can not only exert the functions of high-level programming languages, but also has the advantages of assembly language. Therefore, compared with other programming languages, it has its own unique features. Specifically reflected in the following three aspects:

• First, extensiveness. The size of the operation range of C language directly determines its advantages and disadvantages. The C language contains 34 operators, so the range of operations exceeds that of many other languages. In addition, the expression forms of its operation results are also very rich. In addition, the C language includes various data structure forms such as character type and pointer type. Therefore, it can also handle larger data structure operations.

• Second, simplicity. 9 types of control statements and 32 KEYWORDS are the basic features of C language, which make it widely applicable in computer application writing. It can not only be suitable for the operations of programmers and improve their work efficiency, but also support advanced Programming avoids the tediousness of language switching.

• Third, the structure is perfect. C language is a structured language that can implement modular applications by forming module units. It has significant advantages in system description. At the same time, this feature also enables it to adapt to a variety of different programming requirements and execute efficient.

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