昨天有同學問到：
fopen的 mode 如果只用 "r" 而不是用 "rb"，為什麼批改魔會對？
根據 manpage 的訊息，我節錄一段給各位看：
The mode string can also include the letter ‘‘b’’ either as a
last character or as a character between the characters in any of
the two-character strings described above. This is strictly for
compatibility with ANSI X3.159-1989 (‘‘ANSI C’’) and has no
effect; the ‘‘b’’ is ignored on all POSIX conforming systems,
including Linux. (Other systems may treat text files and binary
files differently, and adding the ‘‘b’’ may be a good idea if
you do I/O to a binary file and expect that your program may be
ported to non-Unix environments.)
簡單地說，POSIX-compliant 的作業系統下，"b" mode 是可以不必使用的
（批改魔的作業系統是 Linux ），但如果在 non-UNIX 環境下有可能會有問題。
所以我才會建議大家針對 binary file 應該要加上 "b" 。
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