Miscellaneous Functions

These functions assign between either the numerator or denominator of a rational, and an integer. Instead of using these functions, it is preferable to use the more general mechanisms mpq_numref and mpq_denref, together with mpz_set.

Function: void mpq_set_num (mpq_t rational, mpz_t numerator)

Copy numerator to the numerator of rational. When this risks to make the numerator and denominator of rational have common factors, you have to pass rational to mpq_canonicalize before any operations are performed on rational.

This function is equivalent to mpz_set (mpq_numref (rational), numerator).

Function: void mpq_set_den (mpq_t rational, mpz_t denominator)

Copy denominator to the denominator of rational. When this risks to make the numerator and denominator of rational have common factors, or if the denominator might be negative, you have to pass rational to mpq_canonicalize before any operations are performed on rational.

In version 1 of the library, negative denominators were handled by copying the sign to the numerator. That is no longer done.

This function is equivalent to mpz_set (mpq_denref (rational), denominators).

Function: void mpq_get_num (mpz_t numerator, mpq_t rational)

Copy the numerator of rational to the integer numerator, to prepare for integer operations on the numerator.

This function is equivalent to mpz_set (numerator, mpq_numref (rational)).

Function: void mpq_get_den (mpz_t denominator, mpq_t rational)

Copy the denominator of rational to the integer denominator, to prepare for integer operations on the denominator.

This function is equivalent to mpz_set (denominator, mpq_denref (rational)).

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