Two questions on GMP library

[Sarad AV]

Hello,

-Does GMP support any C library calls to find natural logarithms or
logartithms to the base 10.

-I  would like to convert an a mpz_t variable to a character string, so that
I can pass it as a string to another library like PARI on Zenfact. I am
unable to find a library call, that does it for me and I guess sscanf(), can
be used either. There is the mpz_set_str() but it does the reverse of what i
am looking for.

Thank you for your time,
Sarad AV
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