Namespace
Varianti

std::stof, std::stod, std::stold

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< cpp‎ | string‎ | basic string

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C++
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Membri funzioni
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elemento accesso
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
Iteratori
Original:
Iterators
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basic_string::begin
basic_string::cbegin
(C++11)
basic_string::end
basic_string::cend
(C++11)
basic_string::rbegin
basic_string::crbegin
(C++11)
basic_string::rend
basic_string::crend
(C++11)
Capacità
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operazioni
Original:
Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Cerca
Original:
Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Costanti
Original:
Constants
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basic_string::npos
Non membri funzioni
Original:
Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll		(C++11)
(C++11)
(C++11)
stoul
stoull		(C++11)
(C++11)
stof
stod
stold		(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Helper classi
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>		(C++11)
 
Elemento definito nell'header <string>
float       stof( const std::string& str, size_t *pos = 0 );
 (1) (dal C++11)
double      stod( const std::string& str, size_t *pos = 0 );
 (2) (dal C++11)
long double stold( const std::string& str, size_t *pos = 0 );
 (3) (dal C++11)
Interpreta un valore in virgola mobile in un str stringa.
Original:
Interprets a floating point value in a string str.
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Funzione scarta eventuali spazi bianchi (come determinato dal std::isspace()) fino al primo carattere non-spazio si trova. Poi ci vuole come numero possibile di caratteri in modo da formare una valida rappresentazione in virgola mobile e li converte in valore in virgola mobile. Il valore di virgola mobile valido può essere uno dei seguenti:
Original:
Function discards any whitespace characters (as determined by std::isspace()) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid floating point representation and converts them to floating point value. The valid floating point value can be one of the following:
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  • espressione decimale in virgola mobile. Si compone delle seguenti parti:
    Original:
    decimal floating point expression. It consists of the following parts:
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  • (opzionale) più o segno meno
    Original:
    (opzionale) plus or minus sign
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  • sequenza non vuota di cifre decimali eventualmente contenenti un carattere punto decimale (definisce significante)
    Original:
    nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)
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  • (opzionale) e o E seguito con meno opzionali o segno più e la sequenza non vuota di cifre decimali (definisce esponente)
    Original:
    (opzionale) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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  • binario espressione virgola mobile. Si compone delle seguenti parti:
    Original:
    binary floating point expression. It consists of the following parts:
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  • (opzionale) più o segno meno
    Original:
    (opzionale) plus or minus sign
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  • 0x or 0X
  • sequenza non vuota di cifre esadecimali eventualmente contenenti un carattere punto decimale (definisce significante)
    Original:
    nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)
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  • (opzionale) p o P seguito con meno opzionali o segno più e la sequenza non vuota di cifre esadecimali (definisce esponente)
    Original:
    (opzionale) p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)
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  • infinito espressione. Si compone delle seguenti parti:
    Original:
    infinity expression. It consists of the following parts:
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  • (opzionale) più o segno meno
    Original:
    (opzionale) plus or minus sign
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  • INF o INFINITY ignorando caso
    Original:
    INF or INFINITY ignoring case
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  • not-a-numero di espressione. Si compone delle seguenti parti:
    Original:
    not-a-number expression. It consists of the following parts:
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  • (opzionale) più o segno meno
    Original:
    (opzionale) plus or minus sign
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  • NAN o NAN( char_sequence ) ignorando caso della parte NAN. Char_sequence' può contenere solo caratteri alfanumerici. Il risultato è un tranquillo punto di valore NaN mobile.
    Original:
    NAN or NAN(char_sequence) ignoring case of the NAN part. char_sequence can only contain alphanumeric characters. The result is a quiet NaN floating point value.
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L'indice del primo carattere non convertito viene memorizzato in pos. Se NULL viene passato come pos, viene ignorato.
Original:
The index of the first unconverted character is stored in pos. If NULL is passed as pos, it is ignored.
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Indice

[modifica] Parametri

str -
la stringa da convertire
Original:
the string to convert
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pos -
indirizzo di integer per memorizzare l'indice del primo carattere non convertito
Original:
address of integer to store the index of the first unconverted character
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[modifica] Valore di ritorno

La stringa convertita nel tipo specificato in virgola mobile.
Original:
The string converted to the specified floating point type.
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[modifica] Eccezioni

std::invalid_argument se la conversione non può essere eseguita
Original:
std::invalid_argument if no conversion could be performed
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std::out_of_range se il valore convertito cadere fuori del campo del tipo di risultato.
Original:
std::out_of_range if the converted value would fall out of the range of the result type.
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[modifica] Vedi anche

(C++11)
(C++11)
(C++11)
 converte una stringa in un intero con segno
(funzione) [modifica]
(C++11)
(C++11)
 converte una stringa in un intero senza segno
(funzione) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/string/basic_string/stof&oldid=26726"