字符常量.

Character	ASCII Representation	ASCII Value	Escape Sequence
Newline	NL (LF)	10 or 0x0a	\n
Horizontal tab	HT	9	\t
Vertical tab	VT	11 or 0x0b	\v
Backspace	BS	8	\b
Carriage return	CR	13 or 0x0d	\r
Formfeed	FF	12 or 0x0c	\f
Alert	BEL	7	\a
Backslash	\	92 or 0x5c	\\
Question mark	?	63 or 0x3f	\?
Single quotation mark	'	39 or 0x27	\'
Double quotation mark	"	34 or 0x22	\"
Octal number	ooo	—	\ooo
Hexadecimal number	hhh	—	\xhhh
Null character	NUL	0	\0

 

 

ref:　　http://msdn.microsoft.com/en-us/library/vstudio/6aw8xdf2(v=vs.110).aspx