public static RatNum make(IntNum num, IntNum den)
{
IntNum g = IntNum.gcd(num, den);
if (den.isNegative())
{
g = IntNum.neg(g);
}
if (!g.isOne())
{
num = IntNum.quotient(num, g);
den = IntNum.quotient(den, g);
}
return(den.isOne() ? (RatNum)num : (RatNum)(new IntFraction(num, den)));
}