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GNU MP 4.1.2

6.2 Conversion Functions

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 (see section 14. 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.