'\87'为什么在C++中不合法啊 它是一个常量的表示吗
我记得好像得用八进制或者十六进制。用十进制不行的哦
C Character Constants
A “character constant” is formed by enclosing a single character from the representable character set within single quotation marks (' '). Character constants are used to represent characters in the execution character set.
Syntax
character-constant :
'c-char-sequence'
L'c-char-sequence'
c-char-sequence :
c-char
c-char-sequence c-char
c-char :
Any member of the source character set except the single quotation mark ('), backslash (\), or newline character
escape-sequence
escape-sequence :
simple-escape-sequence
octal-escape-sequence
hexadecimal-escape-sequence
simple-escape-sequence : one of
\a \b \f \n \r \t \v
\' \" \\ \?
octal-escape-sequence :
\ octal-digit
\ octal-digit octal-digit
\ octal-digit octal-digit octal-digit
hexadecimal-escape-sequence :
\x hexadecimal-digit
hexadecimal-escape-sequence hexadecimal-digit