std::strtoimax, std::strtoumax

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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.

[Bearbeiten] Parameter

[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 INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX oder ​0​ zurückgegeben wird, entspricht .

  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 INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX or ​0​ is returned, as appropriate.

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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

#include <iostream>
#include <string>
#include <cinttypes>
 
int main()
{
    std::string str = "helloworld";
    std::intmax_t val = std::strtoimax(str.c_str(), nullptr, 36);
    std::cout << str << " in base 36 is " << val << " in base 10\n";
 
    char* nptr;
    val = std::strtoimax(str.c_str(), &nptr, 30);
    if(nptr != &str[0] + str.size())
        std::cout << str << " in base 30 is invalid."
                  << " The first invalid digit is " << *nptr << '\n';
}

helloworld in base 36 is 1767707668033969 in base 10
helloworld in base 30 is invalid. The first invalid digit is w

[Bearbeiten] Siehe auch