// Make calls to the classes that does the final calculation
public override double Evaluate()
{
switch (this.Operator)
{
case '+':
AdditionNode add = new AdditionNode('+');
add.Left = this.Left;
add.Right = this.Right;
return(add.Evaluate());
case '-':
SubtractionNode sub = new SubtractionNode('-');
sub.Left = this.Left;
sub.Right = this.Right;
return(sub.Evaluate());
case '*':
MultiplicationNode mul = new MultiplicationNode('*');
mul.Left = this.Left;
mul.Right = this.Right;
return(mul.Evaluate());
case '/':
DivisionNode div = new DivisionNode('/');
div.Left = this.Left;
div.Right = this.Right;
return(div.Evaluate());
default:
break;
}
return(0.0);
}
