public string ToString()
{
string text;
text = "Identifier: " + identifier + ", value: " + value + ", rank: " + rank + ", feature: " + feature + ", parentNode: ";
if (HasParent())
{
text += parentNode.GetIdentifier();
}
else
{
text += "None";
}
text += ", leftNode: " + leftNode.GetIdentifier() + ", rightNode: " + rightNode.GetIdentifier();
return(text);
}