I am trying to implement an asString method for gmp floats but I don't 
quite see how.


Prototype for getting a string is:


"Function: char * mpf_get_str (char *str, mp_exp_t *expptr, int base, 
size_t n_digits, mpf_t op)"

where mp_exp_t *expptr   is just a pointer to a long, and size_t is just 
a long.  I don't get how to set up the primitive call and how to evoke 
it in the asString method.



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