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Escape sequences

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C++
 
Linguaggio C + +
Temi generali
Original:
General topics
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Tabella ASCII
Sequenze di escape
La storia del C + +
Controllo del flusso
Original:
Flow control
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Dichiarazioni esecuzione condizionale
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Conditional execution statements
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Iterazione dichiarazioni
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Iteration statements
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Vai dichiarazioni
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Jump statements
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Funzioni
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Functions
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dichiarazione di funzione
lambda funzione dichiarazione
funzione di modello
specificatore inline
eccezioni specifiche (deprecato)
noexcept specificatore (C++11)
Eccezioni
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Exceptions
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Spazi dei nomi
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Namespaces
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Tipi
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Types
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv specificatori
Durata di stoccaggio specificatori
constexpr specificatore (C++11)
specificatore auto (C++11)
alignas specificatore (C++11)
Inizializzazione
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Initialization
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Letterali
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Literals
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Espressioni
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Expressions
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rappresentazioni alternative
Utilities
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Utilities
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Tipi
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Types
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typedef declaration
Tipo alias dichiarazione (C++11)
attributi (C++11)
Lancia
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Casts
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conversioni implicite
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Fusione C-stile e funzionale
Occupazione della memoria
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Memory allocation
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Classi
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Classes
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Specifiche per una classe di funzioni proprietà
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Class-specific function properties
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esplicito (C++11)
statico
Funzioni membro speciali
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Special member functions
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Modelli
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Templates
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classe template
funzione di modello
modello di specializzazione
parametri confezioni (C++11)
Varie
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Miscellaneous
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Montaggio in linea
 
Le sequenze di escape vengono utilizzati per definire alcuni caratteri speciali all'interno di stringhe letterali.
Original:
Escape sequences are used to define certain special characters within string literals.
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Le sequenze di escape sono disponibili i seguenti:
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
nnnn
Original:
nnnn
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 		arbitrary Unicode value.
May result in several characters. 		code point U+nnnn
\U
nnnnnnnn
Original:
nnnnnnnn
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 		arbitrary Unicode value.
May result in several characters. 		code point U+nnnnnnnn

[modifica] Note

La nuova linea \n carattere ha un significato speciale se usato in modalità testo di I / O, viene convertito il sistema operativo specifico byte nuova riga o una sequenza di byte.
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.
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Sequenze di escape ottali hanno un limite di tre cifre, ma terminare con il primo carattere che non è una cifra ottale valida se incontrate prima.
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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Sequenze di escape esadecimali non hanno limite di lunghezza e termina con il primo carattere che non è una cifra esadecimale valida. Se il valore rappresentato da una singola sequenza di escape esadecimale non rientra l'intervallo di valori rappresentati dal tipo di carattere utilizzato in questa stringa letterale (char, char16_t, char32_t o wchar_t), il risultato non è specificato.
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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Un nome di carattere universale in una stringa stretta letterale può associare a più di una causa di carattere multibyte di codifica.
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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Il punto interrogativo \? sequenza di escape viene utilizzato per impedire trigrammi venga interpretato all'interno letterali stringa: una stringa come "??/" viene compilato come "\", ma se il marchio seconda domanda è scappato, come in "?\?/", diventa "??/"
Original:
The question mark escape sequence \? is used to prevent trigrammi 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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[modifica] Esempio

#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?"

[modifica] Vedi anche

Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/language/escape&oldid=27344"