推荐回答（5个）
一般是转义字符。
转义字符是C语言中表示字符的一种特殊形式。转义字符以反斜'\'开头，后面跟一个字符或一个八进制或十六进制数表示。转义字符具有特定的含义，不同于字符原有的意义，故称转义字符。示例如下：
char c1 = '\''; //后面接一个特殊字符
char c2 = '\110'; //后面接一个三位的八进制数
char c3 = '\x0d'; //后面接一个两位的十六进制数
\ddd 任意字符 三位八进制
\xhh 任意字符 二位十六进制
\ddd：后面跟三位八进制数，该三位八进制数的值即为对应的八进制A S C I I码值。
\xhh：后面跟两位十六进制数，该两位十六进制数为对应字符的十六进制A S C I I码值。
至于十进制的，估计没有，你所说的通常用八进制的
八进制：\o
十六进制：\x
其他转义字符：
转义字符 意义 ASCII码值(十进制)
\a 响铃(BEL) 007
\b 退格(BS) 008
\f 换页(FF) 012
\n 换行(LF) 010
\r 回车(CR) 013
\t 水平制表(HT) 009
\v 垂直制表(VT) 011
\\ 反斜杠 092
\? 问号字符 063
\' 单引号字符 039
\" 双引号字符 034
\0 空字符(NULL) 000
\ddd 任意字符 三位八进制
\xhh 任意字符 二位十六进制
c语言中转义字符后加数字如\65是有意义的，它表示一个具体的字符。
比如说，char
s[]="123\t\65bc";
它初始化的s字符串为“123”后面一个制表符tab，然后是“abc”三个大写字母('\65'就表示一个ascii码值为65的字符，即大写字母a）。
是ASCII码表 - ASCII码对应的符号表
不单单是ASCII码，比如ASCII码48 就是字符'0'
转义字符.
http://www.cnblogs.com/taoxu0903/archive/2008/02/25/1080776.html
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