这是c的基础入门题解，原题来源于谭浩强所编的c程序语言设计（第二版），属于6章13题-This is the basis of c, entry to a problem, the original title from TAN Hao-Qiang c programming language, compiled by Design (second edition), part of chapter 13 of title 6

第一遍： 看完宋劲杉的《一站式学习C编程》的前两部分，1-27章。 对编程有个初步的感觉，知道什么是编译，什么是汇编，什么是连接。 会用命令行编译，调试，运行程序。(First time: After reading Song Jinshan's first two parts of one-stop learning C programming, the 1-27 chapter. It has a preliminary sense of programming, knowing