/// <summary>
/// Name:Evaluate
/// Description:Evaluates the expression tree
/// </summary>
/// <param name="node">inputed node of the expression tree</param>
/// <returns>returns a double of the evaluated expression</returns>
private double Evaluate(BasicNode node)
{
ConstantNode constnode = node as ConstantNode;
if (constnode != null)
{
return(constnode.OperatorValue);
}
VariableNode varnode = node as VariableNode;
if (varnode != null)
{
// used to be a try/catch, but now we set every new variable to 0 when the tree is made, so there will always be a value to obtain.
return(this.variables[varnode.Name]);
}
OperatorNode opnode = node as OperatorNode;
if (opnode != null)
{
return(opnode.Evaluate(this.Evaluate(opnode.Left), this.Evaluate(opnode.Right)));
}
return(0);
}
/// <summary>
/// Name:Evaluate
/// Description:Evaluates the expression tree
/// </summary>
/// <param name="node">inputed node of the expression tree</param>
/// <returns>returns a double of the evaluated expression</returns>
private double Evaluate(BasicNode node)
{
if (node != null && node is OperatorNode)
{
OperatorNode temp = (OperatorNode)node;
return(temp.Evaluate(this.Evaluate(temp.Left), this.Evaluate(temp.Right)));
}
if (node != null && node is VariableNode)
{
try
{
return(this.variables[node.Name]);
}
catch
{
throw new System.ArgumentException("Variable " + node.Name + " has not been defined.", "Variable Not Defined");
}
}
if (node != null && node is ConstantNode)
{
ConstantNode temp = (ConstantNode)node;
return(temp.OperatorValue);
}
return(0);
}