std::strtol, std::strtoll – cppreference.com

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definiert 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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Parameter

str	-	Zeiger auf die null-terminierte Byte-String interpretiert werden Original: pointer to the null-terminated byte string to be interpreted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
str_end	-	Zeiger auf einen Zeiger auf ein Zeichen . Original: pointer to a pointer to character. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
base	-	Base der interpretierten Integer-Wert Original: base of the interpreted integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 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 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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Beispiel

Siehe auch


atoi atol atoll	wandelt ein Byte-String in einen ganzzahligen Wert Original: converts a byte string to an integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

strtoul strtoull	wandelt ein Byte-String in einen vorzeichenlosen Integer-Wert Original: converts a byte string to an unsigned integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

C documentation for strtol, strtoll