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Re: count zeros in a number


"dimitris" <dimmechan at yahoo.com> schrieb im Newsbeitrag 
news:j69104$rda$1 at smc.vnet.net...
> 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
>
You can use the function

f[z_]:=Length[Split[IntegerDigits[z]][[-1]]]
z = 24^24*55^55;
f[z]
62

Wolfgang




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