// SetFrac sets z to a/b and returns z.
func (z *Rat) SetFrac(a, b *Int) *Rat {
z.doinit()
a.doinit()
b.doinit()
// FIXME copying? or referencing?
C.mpq_set_num(&z.i[0], &a.i[0])
C.mpq_set_den(&z.i[0], &b.i[0])
C.mpq_canonicalize(&z.i[0])
return z
}
// SetDenom sets the numerator of z returning z
//
// NB this isn't part of math/big which uses Num().Set() for this
// purpose. In gmp Num() returns a copy hence the need for a SetNum()
// method.
func (z *Rat) SetDenom(a *Int) *Rat {
z.doinit()
a.doinit()
C.mpq_set_den(&z.i[0], &a.i[0])
// If numerator is zero don't canonicalize
if C._mpq_num_sgn(&z.i[0]) != 0 {
C.mpq_canonicalize(&z.i[0])
}
return z
}
func (q *Rat) SetDen(n *Int) *Rat {
q.doinit()
n.doinit()
C.mpq_set_den(&q.i[0], &n.i[0])
return q
}