Most code is written for my homework from the lecture 程序设计(1) (2).
Take 3.1.c as example:
3 is the chapter number, and 1 is the problem number.
How about 3.1/1.c ?
Sometimes I may finish a problem with one more approachs, so all the source
code will be placed under a directory called chapter_num.problem_num. (Of
course, 0 comes the first.)