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 到所有的任务都完成后，即可以完成 C 语言的入门工作。
(The book is divided into six chapters, each chapter a topic, with some pending tasks centered around the C language description of the task Some knowledge of each task is to be completed independently, each completed task, able to master certain knowledge, etc. After all tasks are completed, that work can be completed introductory C language)