public override Numeric addReversed(Numeric x, int k)
{
if (!(x is RatNum))
{
throw new ArgumentException();
}
return(RatNum.add((RatNum)x, this, k));
}
public override Numeric add(object y, int k)
{
if (y is RatNum)
{
return(RatNum.add(this, (RatNum)y, k));
}
if (!(y is Numeric))
{
throw new ArgumentException();
}
return(((Numeric)y).addReversed(this, k));
}