public Add(Node l, Node r)
: base(l, r, "Add")
{
}
public BinOp(Node l, Node r, string operation)
{
this.left = l;
this.right = r;
this.op = operation;
}
public Mult(Node l, Node r)
: base(l, r, "Mult")
{
}
public static Node Diff(Node n)
{
if (n is Number)
{
return new Number(0);
} else if (n is Variable)
{
return new Number(1);
} else if (n is Add)
{
Add m = (Add) n;
return new Add(Diff(m.left), Diff(m.right));
} else
{
Mult m = (Mult) n;
return new Add(new Mult(Diff(m.left), m.right), new Mult(m.left, Diff(m.right)));
}
}