说明：  谭浩强C语言PDF版 早期的C 语言主要是用于UNIX系统。由于Ｃ语言的强大功能和各方面的优点逐渐为人们认识，到了八十年代，C开始进入其它操作系统，并很快在各类大、中、小和微型计算机上得到了广泛的使用，成为当代最优秀的程序设计语言之一。
(Hao Qiang C language PDF version of the early C language mainly used for UNIX systems. Due to the power of C language and various aspects of awareness of the advantages of gradually, by the eighties, C began to enter the other operating system, and soon all kinds of large, medium and small and micro-computers have been widely used as a the best of contemporary programming languages.)