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MathGroup Archive 2011

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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




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