Re: tonumber

[George Neill <georgen@...>]

On Mon, Aug 10, 2009 at 10:33 PM, George Neill<georgen@neillnet.com> wrote:
> On Mon, Aug 10, 2009 at 10:26 PM, Sam Roberts<vieuxtech@gmail.com> wrote:
>> On Mon, Aug 10, 2009 at 7:38 PM, George Neill<georgen@neillnet.com> wrote:
>>> [gneill@blackfoot ~]$ cat !$
>>> cat t.lua
>>> print( tonumber( "ff", G))
>>> print( tonumber( "ff", 16))
>>> print( tonumber( "GG", H))
>>> print( tonumber( "GG", 17))
>>>
>>> [gneill@blackfoot ~]$ ~/tmp/lua-5.1.4/src/lua < t.lua
>>> nil
>>> 255
>>> nil
>>> 288
>>>
>>> looking at the luaB_tonumber function ...
>>>
>>> static int luaB_tonumber (lua_State *L) {
>>>  int base = luaL_optint(L, 2, 10);
>>>
>>> luaL_optint returns the default (10) when passed A, B, C ... etc...
>>
>> No, A, B, C are names of undefined variables, so you are passing nil
>> as the second argument. Passing nil causes the default to be used.
>
> Makes complete sense.  Is it possible to pass A-Z as the documentation suggests?

oh man, I completely misread that
(http://www.lua.org/manual/5.1/manual.html#pdf-tonumber)

sorry for the noise.

Thanks,
George