I'm not sure this is strictly necessary, but I think it's a good idea to
explicitly use the "C*" types when doing formatting with varargs, to make
sure the calling convention matches what the callee expects:
String(format: "%llx", CLongLong(myNumber))
On Wed, May 25, 2016 at 1:19 PM, Jens Alfke via swift-users <
swift-users@swift.org> wrote:
>
> On May 25, 2016, at 12:10 PM, Ken Burgett <k...@iotone.io> wrote:
>
> You are correct, the "%llx" works for UInt64, while "%16x" does not.
> "%llX" also works, producing an uppercase string.
> Should this be reported as a bug?
>
>
> No, it’s correct behavior. You need to use the “ll” ("long long") modifier
> to specify that the parameter is a 64-bit value.
>
> —Jens
>
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