public double evaluate(EvaluationNode node)
{
if (node == null)
{
return(0);
}
else if (node.getNodeType() == EvaluationNodeType.NUMBER)
{
NumberNode numberNode = (NumberNode)node;
return(numberNode.evaluate());
}
else if (node.getNodeType() == EvaluationNodeType.VARIABLE)
{
VariableNode variableNode = (VariableNode)node;
return(variableNode.evaluate(x));
}
else if (node.getNodeType() == EvaluationNodeType.FUNCTION)
{
FunctionNode functionNode = (FunctionNode)node;
return(functionNode.evaluate(x));
}
else
{
OperatorNode operatorNode = (OperatorNode)node;
double a = evaluate(node.left);
double b = evaluate(node.right);
return(operatorNode.evaluate(a, b));
}
}