/// <summary>
/// Function to evaluate the value of the expression tree.
/// </summary>
/// <param name="root"> Expression tree root.</param>
/// <returns> evaluated value of tree.</returns>
private double Evaluate(ExpressionTreeNode root)
{
ConstantNode constantNode = root as ConstantNode; // will return null if node isn't constantNode.//
if (constantNode != null)
{
return(constantNode.Value);
}
VariableNode variableNode = root as VariableNode;
if (variableNode != null)
{
return(variableNode.Evaluate());
}
OperatorNode operatorNode = root as OperatorNode;
if (operatorNode != null)
{
return(operatorNode.Evaluate());
}
throw new NotSupportedException();
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionTree"/> class.
/// </summary>
/// <param name="expression"> Denotes the expression to be converted.</param>
public ExpressionTree(string expression)
{
this.root = this.Compile(expression);
this.Expression = expression;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionTree"/> class.
/// Default ExpretionTree.
/// </summary>
/// <param name="expression">the infixexpresstion to be evaluated.</param>
public ExpressionTree(string expression)
{
this.root = this.BuildTree(expression);
}
