public double Evaluation()
{
double value = 0;
switch (this.Expression)
{
case Expression.Add:
value = PreviousToken.Evaluation() + NextToken.Evaluation();
break;
case Expression.Subtract:
value = PreviousToken.Evaluation() - NextToken.Evaluation();
break;
case Expression.Multiply:
value = PreviousToken.Evaluation() * NextToken.Evaluation();
break;
case Expression.Divide:
if (NextToken.Evaluation() == 0)
{
throw new RuntimeError("You attempted to divide by zero.");
}
value = PreviousToken.Evaluation() / NextToken.Evaluation();
break;
case Expression.Positive:
value = NextToken.Evaluation();
break;
case Expression.Negative:
value = NextToken.Evaluation() * -1;
break;
case Expression.Exponent:
value = Math.Pow(PreviousToken.Evaluation(), NextToken.Evaluation());
break;
case Expression.OpenParenthesis:
value = NextToken.Evaluation();
break;
default:
break;
}
return(value);
}
public override int GetHashCode()
{
int hash = 1;
if (PreviousToken.Length != 0)
{
hash ^= PreviousToken.GetHashCode();
}
if (Token.Length != 0)
{
hash ^= Token.GetHashCode();
}
if (_unknownFields != null)
{
hash ^= _unknownFields.GetHashCode();
}
return(hash);
}
