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- Subject: Re: formatting long integers
- From: Leo Razoumov <slonik.az@...>
- Date: Thu, 18 Mar 2010 13:39:23 -0400
On 2010-03-18, David Kastrup <email@example.com> wrote:
> Leo Razoumov <firstname.lastname@example.org> writes:
> > On 2010-03-18, Pan Shi Zhu <email@example.com> wrote:
> >> >>
> >> According to the manual, %d is defined to deal with 32-bit signed integer.
> > At present, Lua-5.1.4 manual does *NOT* link %d to 32-bit integers but
> > think that it should.
> Since Lua implements its own formatting functions and %d, a 32-bit
> restriction appears rather out of place. A major point of Lua's unified
> number type is that integers are implicitly defined by what fits the
> mantissa of the underlying floating point type, with "soft" degradation
> beyond. That will tend to be something like 53bit or so. Introducing
> an additional threshold where things start to go wrong feels artificial.
I absolutely agree. But the current implementation of %d does truncate
lua_Number to a 32 bit signed integer and the manual does not warn