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## 6.2 Conversion Functions

- Function:
*double***mpq_get_d***(const mpq_t*`op`) Convert

`op`to a`double`

, truncating if necessary (i.e. rounding towards zero).If the exponent from the conversion is too big or too small to fit a

`double`

then the result is system dependent. For too big an infinity is returned when available. For too small*0.0*is normally returned. Hardware overflow, underflow and denorm traps may or may not occur.

- Function:
*void***mpq_set_d***(mpq_t*`rop`, double`op`) - Function:
*void***mpq_set_f***(mpq_t*`rop`, const mpf_t`op`) Set

`rop`to the value of`op`. There is no rounding, this conversion is exact.

- Function:
*char ****mpq_get_str***(char **`str`, int`base`, const 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 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 beingmpz_sizeinbase (mpq_numref(

`op`),`base`) + mpz_sizeinbase (mpq_denref(`op`),`base`) + 3The 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`.

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