On 09/03/2014 11:53 AM, Calogero Mauceri wrote:
> Hi all,
>
> I'm doing something really simple, but which is driving me crazy.
>
> I'm reading a string from a file and converting it to a long long
> integer, but the conversion fails.
> The code I'm running is as simple as this
>
> // this string is read from a file
> QString str("18446744073709551615");
> bool ok;
> qint64 value = str.toLongLong(&ok); // Error
>
> the number should be representable in 64 bit. Am I doing something wrong?
>
> More hints, if I convert the number to unsigned long long integer then
> it works
>
> bool ok;
> quint64 value = str.toULongLong(&ok); // OK
>
> Similarly initializing the long long from the literal value is failing too
>
> Q_INT64_C(18446744073709551615) ; // Error, returns -1
> Q_UINT64_C(18446744073709551615); // OK
>
> Thanks for your help!
> Calogero
>
18446744073709551615 is too big to fit into a long long. It is actually the
biggest number you can have a unsigned long long. A long long can't fit the
same size number because it has to use one bit to hold the sign. The maximum
number you can fit in a long long is 9223372036854775807.
Nate
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