Ｃ语言是一种结构化语言。它层次清晰，便于按模块化方式组织程序，易于调试和维护。-C language is a structured language. Its level of clear, easy way to organize a modular program, easy to debug and maintain. Performance and processing capabilities of the C language strong. It not only has a wealth of data types and operators, to facilitate the realization of all kinds of complex data structures. It also has direct access to physical memory addresses, the operation bit (bit) level. Since the C language programming operation of the hardware, so the feature set of high-level language C language and low-level languages ​ ​ in one. Can be used for system software development, is also suitable for application software development. In addition, C language also has high efficiency, portability, and other characteristics. So widely ported to various types of various types of computers, thus forming a variety of versions of the C language.