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std::strtol, std::strtoll

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Null-terminated strings
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Null-terminierte Byte-Strings
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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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atof
atoi
atol
atoll
strtol
strtoll
String-Manipulation
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String manipulation
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Defined in header <cstdlib>
long      strtol( const char *str, char **str_end, int base );
long long strtoll( const char *str, char **str_end, int base );
(seit C++11)
Legt einen Integer-Wert in einem Byte String, auf den str .
Original:
Interprets an integer value in a byte string pointed to by str.
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Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid base-n (where n=base) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

  • (optional) plus or minus sign
  • (optional) prefix (0) indicating octal base (applies only when the base is 8)
  • (optional) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16)
  • a sequence of digits

The set of valid digits for base-2 integer is 01, for base-3 integer is 012, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

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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Wenn die str ist leer oder nicht die erwartete Form, wird keine Konvertierung durchgeführt, und (wenn str_end nicht NULL) der Wert str im Objekt, auf das str_end gespeichert .
Original:
If the str is empty or does not have the expected form, no conversion is performed, and (if str_end is not NULL) the value of str is stored in the object pointed to by str_end.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

str -
Zeiger auf die null-terminierte Byte-String interpretiert werden
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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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base -
Base der interpretierten Integer-Wert
Original:
base of the interpreted integer value
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[Bearbeiten] Rückgabewert

  • Wenn dies gelingt, ist ein ganzzahliger Wert entsprechend dem Inhalt des str zurückgegeben .
    Original:
    If successful, an integer value corresponding to the contents of str is returned.
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  • Wenn der umgewandelte Wert fällt außerhalb der Reichweite des zugehörigen Rückgabetyp, tritt ein Fehler Bereich (Einstellung [[cpp/error/errno|errno]] um ERANGE) und LONG_MAX, LONG_MIN, LLONG_MAX oder LLONG_MIN zurückgegeben .
    Original:
    If the converted value falls out of range of corresponding return type, a range error occurs (setting [[cpp/error/errno|errno]] to ERANGE) and LONG_MAX, LONG_MIN, LLONG_MAX or LLONG_MIN is returned.
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  • Wenn keine Umwandlung durchgeführt werden kann, wird zurückgegeben 0 .
    Original:
    If no conversion can be performed, 0 is returned.
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[Bearbeiten] Beispiel

[Bearbeiten] Siehe auch

wandelt ein Byte-String in einen ganzzahligen Wert
Original:
converts a byte string to an integer value
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(Funktion) [edit]
wandelt ein Byte-String in einen vorzeichenlosen Integer-Wert
Original:
converts a byte string to an unsigned integer value
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(Funktion) [edit]
C documentation for strtol, strtoll