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Varianti

std::strtof, std::strtod, std::strtold

Da cppreference.com.
< cpp‎ | string‎ | byte

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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
 
Null-stringhe terminate byte
Funzioni
Original:
Functions
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Carattere manipolazione
Original:
Character manipulation
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Le conversioni in formati numerici
Original:
Conversions to numeric formats
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strtoul
strtoull
strtof
strtod
strtold
Della gestione delle stringhe
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
String esame
Original:
String examination
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Memoria manipolazione
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varie
Original:
Miscellaneous
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strerror
 
Elemento definito nell'header <cstdlib>
float       strtof( const char* str, char** str_end );
 (dal C++11)
double      strtod( const char* str, char** str_end );
long double strtold( const char* str, char** str_end );
 (dal C++11)
Interpreta un valore in virgola mobile in una stringa di byte puntato da str.
Original:
Interprets a floating point value in a byte string pointed to by 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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