C语言是一种计算机程序设计语言。它既具有高级语言的特点，又具有汇编语言的特点。它由美国贝尔研究所的D.M.Ritchie于1972年推出。1978后，C语言已先后被移植到大、中、小及微型机上。它可以作为工作系统设计语言，编写系统应用程序，也可以作为应用程序设计语言，编写不依赖计算机硬件的应用程序。它的应用范围广泛，具备很强的数据处理能力，不仅仅是在软件开发上，而且各类科研都需要用到C语言，适于编写系统软件，三维，二维图形和动画。具体应用比如单片机以及嵌入式系统开发。-C language is a computer programming language. It already has the high-level language characteristic, and has the characteristics of the assembly language. By the American institute of bell it D.M.R itchie released in 1972. After 1978, the C language already has been transplanted into large, medium, small and micro machine. It can be used as a working system design language, writing system application, also can be used as the application design language, writing, do not depend on the computer hardware applications. Its wide application, strong ability to handle data, it is not only in the development of software, and all kinds of scientific research are need to use C language, and is suitable for writing system software, 3 d and 2 d graphics and animation. Specific application such as single chip microcomputer and embedded system development.