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std::dec, std::hex, std::oct

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< cpp‎ | io‎ | manip

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
Original:
Streams
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Abstractions
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
D'entrée / sortie manipulateurs
À virgule flottante en forme
Original:
Floating-point formatting
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Formatage entier
Original:
Integer formatting
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dec
hex
oct
Formatage booléen
Original:
Boolean formatting
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boolalpha
noboolalpha
Largeur de champ et de contrôle de remplissage
Original:
Field width and fill control
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Autre mise en forme
Original:
Other formatting
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Traitement des espaces blancs
Original:
Whitespace processing
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Sortie de rinçage
Original:
Output flushing
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Indicateurs d'état manipulation
Original:
Status flags manipulation
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Temps et d'argent I / O
Original:
Time and money I/O
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get_money (C++11)
get_time (C++11)
put_money (C++11)
put_time (C++11)
 
Defined in header <ios>
(1)
(2)
(3)
Modifie la base numérique par défaut pour l'entier I / O
Original:
Modifies the default numeric base for integer I/O
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1)
définit le basefield de la str flux de dec comme si en appelant str.setf(std::ios_base::dec, std::ios_base::basefield)
Original:
sets the basefield of the stream str to dec as if by calling str.setf(std::ios_base::dec, std::ios_base::basefield)
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2)
définit le basefield de la str flux de hex comme si en appelant str.setf(std::ios_base::hex, std::ios_base::basefield)
Original:
sets the basefield of the stream str to hex as if by calling str.setf(std::ios_base::hex, std::ios_base::basefield)
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3)
définit le basefield de la str flux de oct comme si en appelant str.setf(std::ios_base::oct, std::ios_base::basefield)
Original:
sets the basefield of the stream str to oct as if by calling str.setf(std::ios_base::oct, std::ios_base::basefield)
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Il s'agit d'un manipulateur d'E / S, il peut être appelé avec une expression telle que pour tout out << std::hex out de std::basic_ostream type ou d'une expression telle que pour tout in >> std::hex in de std::basic_istream type .
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::hex for any out of type std::basic_ostream or with an expression such as in >> std::hex for any in of type std::basic_istream.
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Sommaire

[modifier] Paramètres

str -
référence aux flux d'entrée / sortie
Original:
reference to I/O stream
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[modifier] Retourne la valeur

str (référence au flux après la manipulation)
Original:
str (reference to the stream after manipulation)
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[modifier] Exemple

#include <iostream>
#include <sstream>
int main()
{
    std::cout << "The number 42 in octal:   " << std::oct << 42 << '\n'
              << "The number 42 in decimal: " << std::dec << 42 << '\n'
              << "The number 42 in hex:     " << std::hex << 42 << '\n';
    int n;
    std::istringstream("2A") >> std::hex >> n;
    std::cout << std::dec << "Parsing \"2A\" as hex gives " << n << '\n';
}

Résultat :

The number 42 in octal:   52
The number 42 in decimal: 42
The number 42 in hex:     2a
Parsing "2A" as hex gives 42

[modifier] Voir aussi

modifie la base utilisée pour l'entier I / O
Original:
changes the base used for integer I/O
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(fonction) [edit]
contrôle si le préfixe est utilisé pour indiquer base numérique
Original:
controls whether prefix is used to indicate numeric base
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(fonction) [edit]