Re: count zeros in a number

*To*: mathgroup at smc.vnet.net*Subject*: [mg121817] Re: count zeros in a number*From*: "Harvey P. Dale" <hpd1 at nyu.edu>*Date*: Mon, 3 Oct 2011 04:24:18 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201110020636.CAA28027@smc.vnet.net>

=09 zeroes[n_]:=Module[{idn=IntegerDigits[n]},If[Last[idn]==0,Length[Split[i dn][[-1]]],0]] zeroes[24^24 55^55] Best, Harvey -----Original Message----- From: dimitris [mailto:dimmechan at yahoo.com] Sent: Sunday, October 02, 2011 2:37 AM To: mathgroup at smc.vnet.net Subject: [mg121817] count zeros in a number Hello. Consider e.g. the number 24^24*55^55. This number ends with exactly 55 zeros as the following demonstrate In[201]:= Mod[24^24*55^55, 10^55] Mod[24^24*55^55, 10^56] Out[201]= 0 Out[202]= 20000000000000000000000000000000000000000000000000000000 What I want now is a way to count the zeros that a number ends without knowing in advance this number of zeros like in the above example. Thanks in advance. Dimitris

**References**:**count zeros in a number***From:*dimitris <dimmechan@yahoo.com>