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(gmp.info)Rational Conversions

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Conversion Functions
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 - Function: double mpq_get_d (mpq_t OP)
     Convert OP to a `double'.

 - Function: void mpq_set_d (mpq_t ROP, double OP)
 - Function: void mpq_set_f (mpq_t ROP, mpf_t OP)
     Set ROP to the value of OP, without rounding.

 - Function: char * mpq_get_str (char *STR, int BASE, mpq_t OP)
     Convert OP to a string of digits in base BASE.  The base may vary
     from 2 to 36.  The string will be of the form `num/den', or if the
     denominator is 1 then just `num'.

     If STR is `NULL', the result string is allocated using the current
     allocation function (Note: Custom Allocation).  The block will be
     `strlen(str)+1' bytes, that being exactly enough for the string and
     null-terminator.

     If STR is not `NULL', it should point to a block of storage large
     enough for the result, that being

          mpz_sizeinbase (mpq_numref(OP), BASE)
          + mpz_sizeinbase (mpq_denref(OP), BASE) + 3

     The three extra bytes are for a possible minus sign, possible
     slash, and the null-terminator.

     A pointer to the result string is returned, being either the
     allocated block, or the given STR.