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strtof, strtod, strtold

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< c‎ | string‎ | byte

 
 
 
Null-terminierte Byte-Strings
Funktionen
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Functions
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Character Manipulation
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Character manipulation
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Umwandlungen in numerische Formate
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Conversions to numeric formats
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strtoul
strtoull
strtof
strtod
strtold
String-Manipulation
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
String Prüfung
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String examination
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Speicher Manipulation
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Verschiedenes
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Miscellaneous
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strerror
 
Defined in header <stdlib.h>
float       strtof( const char* str, char** str_end );
double      strtod( const char* str, char** str_end );
long double strtold( const char* str, char** str_end );
Legt einen Gleitkommawert in einem Byte String, auf den str .
Original:
Interprets a floating point value in a byte string pointed to by str.
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Funktion verwirft alle Whitespace-Zeichen (wie std::isspace() bestimmt) bis zum ersten Nicht-Whitespace-Zeichen gefunden wird. Dann dauert es so viele Zeichen wie möglich, um eine gültige Gleitkomma-Darstellung bilden und wandelt sie in Fließkommazahl. Der gültige Gleitkommawert kann eine der folgenden sein:
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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  • Gleitpunktberechnungen Ausdruck. Es besteht aus folgenden Teilen:
    Original:
    decimal floating point expression. It consists of the following parts:
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  • (optional) Plus-oder Minuszeichen
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    (optional) plus or minus sign
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  • nichtleere Folge von Dezimalziffern gegebenenfalls ein Dezimalzeichen (definiert Mantisse)
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    nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)
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  • (optional) e oder E folgte mit optional Minus-oder Pluszeichen und nichtleere Folge von Dezimalziffern (definiert Exponent)
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    (optional) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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  • binäre Fließkomma-Ausdruck. Es besteht aus folgenden Teilen:
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    binary floating point expression. It consists of the following parts:
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  • (optional) Plus-oder Minuszeichen
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    (optional) plus or minus sign
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  • 0x or 0X
  • nichtleere Folge von Hexadezimalziffern gegebenenfalls ein Dezimalzeichen (definiert Mantisse)
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    nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)
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  • (optional) p oder P folgte mit optional Minus-oder Pluszeichen und nichtleere Folge von Hexadezimalziffern (definiert Exponent)
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    (optional) p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)
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  • infinity Ausdruck. Es besteht aus folgenden Teilen:
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    infinity expression. It consists of the following parts:
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  • (optional) Plus-oder Minuszeichen
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    (optional) plus or minus sign
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  • INF oder INFINITY ignorieren Fall
    Original:
    INF or INFINITY ignoring case
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  • not-a-number Ausdruck. Es besteht aus folgenden Teilen:
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    not-a-number expression. It consists of the following parts:
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  • (optional) Plus-oder Minuszeichen
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    (optional) plus or minus sign
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  • NAN oder NAN( char_sequence ) ignorieren Fall des NAN Teil. Char_sequence kann nur alphanumerische Zeichen enthalten. Das Ergebnis ist ein ruhiger NaN Gleitkommawert .
    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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Die Funktionen setzt den Zeiger auf die durch str_end auf das Zeichen nach dem letzten Zeichen interpretiert zeigen. Wenn str_end NULL ist, wird es ignoriert .
Original:
The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is NULL, it is ignored.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

str -
Zeiger auf die null-terminierte Byte-String interpretiert werden
Original:
pointer to the null-terminated byte string to be interpreted
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str_end -
Zeiger auf einen Zeiger auf ein Zeichen .
Original:
pointer to a pointer to character.
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[Bearbeiten] Rückgabewert

Floating-Point-Wert, der den Inhalt der str auf Erfolg. Wenn der umgewandelte Wert fällt außerhalb der Reichweite des zugehörigen Rückgabetyp tritt Entfernungsfehlers und HUGE_VAL, HUGE_VALF oder HUGE_VALL zurückgegeben. Wenn keine Umwandlung durchgeführt werden kann, wird zurückgegeben 0 .
Original:
Floating point value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, range error occurs and HUGE_VAL, HUGE_VALF or HUGE_VALL is returned. If no conversion can be performed, 0 is returned.
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[Bearbeiten] Beispiel

[Bearbeiten] Siehe auch

wandelt ein Byte String in eine Gleitkommazahl
Original:
converts a byte string to a floating point value
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(Funktion) [edit]
C++ documentation for strtof, strtod, strtold