Escape sequences
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エスケープシーケンスは、文字列リテラル内に特定の特殊文字を定義するために使用され.
Original:
Escape sequences are used to define certain special characters within string literals.
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以下のエスケープシーケンスが用意されています
Original:
The following escape sequences are available:
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| 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
|
\u
|
arbitrary ユニコード value. May result in several characters. |
code point U+nnnn
|
\U
|
arbitrary ユニコード value. May result in several characters. |
code point U+nnnnnnnn
|
[編集] ノート
テキストモードのI / Oで使用された場合、改行文字
\nは特別な意味を持っている、それは、OS固有の改行バイトまたはバイトシーケンスに変換されている.Original:
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.The text has been machine-translated via Google Translate.
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進数のエスケープシーケンスは、3桁の8進数の限界を持っていますが、より早く検出された場合、有効な8進数字ではない最初の文字で終了し.
Original:
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.
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16進数のエスケープシーケンスの長さに制限がなく、有効な16進数の数字ではない最初の文字で終了します。単一の16進数のエスケープシーケンスによって表される値がこの文字列で使用する文字の種類によって表される値の範囲に収まらない場合はリテラル（char、char16_t、char32_t、またはwchar_t）、結果は不定です.
Original:
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.
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リテラル文字列内の狭いユニバーサル文字名はエンコードをマルチバイトに複数のChar原因にマップされる場合があります.
Original:
A universal character name in a narrow string literal may map to more than one char due to multibyte encoding.
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疑問符のエスケープシーケンス\?は、文字列リテラル内で解釈されるのトリグラフを防ぐために使用されます：そのような"??/"として文字列が"\"としてコンパイルされますが、2番目の疑問符が"?\?/"のように、エスケープされている場合、それは"??/"なります
Original:
The question mark escape sequence \? is used to prevent トリグラフ from being interpreted inside string literals: a string such as "??/" is compiled as "\", but if the second question mark is escaped, as in "?\?/", it becomes "??/"
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[編集] 例
#include <iostream> int main() { std::printf("This\nis\na\ntest\n\nShe said, \"How are you?\"\n"); }
Output:
This is a test She said, "How are you?"
