std::fixed, std::scientific, std::hexfloat, std::defaultfloat
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| Elemento definito nell'header <ios>
|
||
| std::ios_base& fixed( std::ios_base& str ); |
(1) | |
| std::ios_base& scientific( std::ios_base& str ); |
(2) | |
| std::ios_base& hexfloat( std::ios_base& str ); |
(3) | (dal C++11) |
| std::ios_base& defaultfloat( std::ios_base& str ); |
(4) | (dal C++11) |
Modifica la formattazione predefinita per floating-point I / O
1) Original:
Modifies the default formatting for floating-point I/O
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imposta il
2) floatfield del str flusso di fixed come se chiamando str.setf(std::ios_base::fixed, std::ios_base::floatfield)Original:
sets the
floatfield of the stream str to fixed as if by calling str.setf(std::ios_base::fixed, std::ios_base::floatfield)The text has been machine-translated via Google Translate.
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imposta il
3) floatfield del str flusso di scientific come se chiamando str.setf(std::ios_base::scientific, std::ios_base::floatfield)Original:
sets the
floatfield of the stream str to scientific as if by calling str.setf(std::ios_base::scientific, std::ios_base::floatfield)The text has been machine-translated via Google Translate.
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imposta il
4) basefield del flusso str di fixed e scientific contemporaneamente come se chiamando str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). In questo modo esadecimale in virgola mobile di formattazione.Original:
sets the
basefield of the stream str to fixed and scientific simultaneously as if by calling str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). This enables hexadecimal floating-point formatting.The text has been machine-translated via Google Translate.
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imposta il
basefield del str flusso a zero, come se chiamando str.unsetf(std::ios_base::floatfield). Questo permette virgola mobile formattazione predefinita, che è diverso dal fisso e scientifica.Original:
sets the
basefield of the stream str to zero, as if by calling str.unsetf(std::ios_base::floatfield). This enables the default floating-point formatting, which is different from fixed and scientific.The text has been machine-translated via Google Translate.
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Si tratta di un manipolatore di I / O, può essere chiamato con espressioni quali out << std::fixed per qualsiasi
out di std::basic_ostream tipo o con un'espressione come in >> std::scientific per qualsiasi in di std::basic_istream tipo.Original:
This is an I/O manipulator, it may be called with an expression such as out << std::fixed for any
out of type std::basic_ostream or with an expression such as in >> std::scientific for any in of type std::basic_istream.The text has been machine-translated via Google Translate.
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Indice |
[modifica] Parametri
| str | - | riferimento al flusso di I / O
Original: reference to I/O stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[modifica] Valore di ritorno
str (riferimento al flusso dopo la manipolazione)Original:
str (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
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[modifica] Esempio
#include <iostream> #include <sstream> int main() { std::cout << "The number 0.01 in fixed: " << std::fixed << 0.01 << '\n' << "The number 0.01 in scientific: " << std::scientific << 0.01 << '\n' << "The number 0.01 in hexfloat: " << std::hexfloat << 0.01 << '\n' << "The number 0.01 in default: " << std::defaultfloat << 0.01 << '\n'; double f; std::istringstream("0x1P-1022") >> std::hexfloat >> f; std::cout << "Parsing 0x1P-1022 as hex gives " << f << '\n'; }
Output:
The number 0.01 in fixed: 0.010000 The number 0.01 in scientific: 1.000000e-02 The number 0.01 in hexfloat: 0x1.47ae147ae147bp-7 The number 0.01 in default: 0.01 Parsing 0x1P-1022 as hex gives 2.22507e-308
[modifica] Vedi anche
| cambiamenti in virgola mobile di precisione Original: changes floating-point precision The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione) | |
