进位制和编码
Chapter 1 section 1 done.
Update C1S1.txt
Charpter 1 section 3 done.
Recommitted till C1S3.
Chapter 1 section 4 done.
Chapter 1 section 4 done.
Merge branch 'master' of github.com:SenSing/Programming-Guide into tim
Makefile & new content
Merge branch 'master' into ssing
Change to LaTeX.
Pictures inserted.
tim-3.tex
Merge branch 'master' of github.com:SenSing/Programming-Guide into tim
Merge branch 'ssing'

Conflicts:
	Makefile
	main.tex