Escape sequences
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Escape-Sequenzen werden verwendet, um bestimmte Sonderzeichen in String-Literalen zu definieren.
Die folgenden Escape-Sequenzen stehen zur Verfügung:
| Escape sequence | Description | Representation |
|---|---|---|
\' | single quote | byte 0x27 |
\" | double quote | byte 0x22 |
\? | question mark | byte 0x3f |
\\ | backslash | byte 0x5c |
\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 Unicode value. Kann mehrere Zeichen ergeben. | code point U+nnnn |
\U | arbitrary Unicode value. Kann mehrere Zeichen ergeben. | code point U+nnnnnnnn |
[Bearbeiten]Notes
Die new-line Zeichen
\n hat eine besondere Bedeutung, wenn im Text-Modus I / O verwendet wird, wird es dem OS-spezifische newline Byte oder Byte-Sequenz umgewandelt .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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Octal Escape-Sequenzen haben eine Frist von drei Oktalziffern, sondern enden an der ersten Zeichen, das nicht ein gültiger Oktalziffer ggf. auch früher .
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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Hexadezimale Escape-Sequenzen haben keine Längenbegrenzung und enden mit dem ersten Zeichen, die keine gültige Hexadezimalzahl. Wenn der Wert von einem einzigen hexadezimale Escape-Sequenz dargestellt nicht passt den Bereich der Werte von der Charakter-Typ in dieser Zeichenfolge vertreten Literal (char, char16_t, char32_t oder wchar_t), ist das Ergebnis nicht näher .
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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Eine universelle Charakter-Namen in einem engen String-Literal kann mehr als ein char aufgrund zuordnen Kodierung multibyte .
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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Das Fragezeichen Escape-Sequenz \? wird verwendet, um trigraphs aus im Inneren Zeichenfolgenliterale interpretiert wird: ein String, wie "??/" als "\" kompiliert, aber wenn das zweite Fragezeichen entgangen, wie in "?\?/", wird es "??/"
Original:
The question mark escape sequence \? is used to prevent trigraphs 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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[Bearbeiten]Beispiel
#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?"
