Counting digit
Paul Zimmermann
Paul.Zimmermann at loria.fr
Tue Mar 16 20:44:01 CET 2010
Giovanni,
> I must count digits "1" in a base 18 number.
> Does'it exist a function in Gmp, like DigitCount function in Mathematica?
there is mpz_sizeinbase, but it might be wrong by 1 for base 18:
-- Function: size_t mpz_sizeinbase (mpz_t OP, int BASE)
Return the size of OP measured in number of digits in the given
BASE. BASE can vary from 2 to 62. The sign of OP is ignored,
just the absolute value is used. The result will be either exact
or 1 too big. If BASE is a power of 2, the result is always
exact. If OP is zero the return value is always 1.
You might also use mpz_get_str and strlen for an exact result.
Paul Zimmermann
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