متسلسلات الهروب
تستخدم متسلسلات الهروب لتمثيل بعض الحروف الخاصة داخل سلاسل المحارف وثوابت الحروف.
تتوفر متسلسلات الهروب التالية:
| Escape sequence |
Description | Representation |
|---|---|---|
\'
|
single quote | byte 0x27
|
\"
|
double quote | byte 0x22
|
\?
|
question mark | byte 0x3f
|
\\
|
backslash | byte 0x5c
|
\0
|
null character | byte 0x00
|
\a
|
audible bell | byte 0x07
|
\b
|
backspace | byte 0x08
|
\f
|
form feed - new page | byte 0x0c
|
\n
|
line feed - new line | byte 0x0a
|
\r
|
carriage return | byte 0x0d
|
\t
|
horizontal tab | byte 0x09
|
\v
|
vertical tab | byte 0x0b
|
\nnn
|
arbitrary octal value | byte nnn
|
\xnn
|
arbitrary hexadecimal value | byte nn
|
\unnnn
|
arbitrary Unicode value. May result in several characters. |
code point U+nnnn
|
\Unnnnnnnn
|
arbitrary Unicode value. May result in several characters. |
code point U+nnnnnnnn
|
Notes
The new-line character \n has special meaning when used in text mode I/O, it is converted to the OS-specific newline byte or byte sequence.
Octal escape sequences have a limit of three octal digits, but terminate at the first character that is not a valid octal digit if encountered sooner.
Hexadecimal escape sequences have no length limit and terminate at the first character that is not a valid hexadecimal digit. If the value represented by a single hexadecimal escape sequence does not fit the range of values represented by the character type used in this string literal (char, char16_t, char32_t, or wchar_t), the result is unspecified.
A universal character name in a narrow string literal may map to more than one char due to multibyte encoding.
Example
#include <iostream>
int main()
{
std::printf("This\nis\na\ntest\n\nShe said, \"How are you?\"\n");
}
الخرج:
This
is
a
test
She said, "How are you?"