gmp_printf vs mpz_get_string

[Joakim Carselind]

Hi,

Currently working on a project (Integer factorization) and have a question
about gmp_printf vs mpz_get_string.

Need to store the resulting factors in a buffer (2^100 max size so
char[201] to account for \n and \0) so currently I do the following

char buffer[31 * sizeof(char)];
void
addFactor(char * factors, mpz_t n)
{
   mpz_get_string(buffer, 10, n);
  // add each digit in buffer to factors array
}

Is calling mpz_get_string a significant overhead vs calling gmp_printf()?
IFF the factorization is known to be complete I can print the result
directly from where it was computed. This could be achieved by trial and
error using the tester.

Regards