说明：  本书共分六章，每章一个专题，以一些待完成的任务为中心，围绕该任务介绍 C 语言 的一些知识，每一个任务都是可以独立完成的，每完成一个任务，都能掌握一定的知识，等到所有的任务成后，即可以完成C 语言的入门工作。
(This book is divided into six chapters, each chapter of a feature to some of the tasks to be centered around the mission briefing some knowledge of C language, independently of each task is completed, each completed task, be able to master certain knowledge, until after all the tasks into, thus completing the C-entry work.)