private static void CreateExpression(Operator op)
{
Expression lhs;
Expression rhs = expressions.Pop();
if (op.IsUnary())
{
lhs = rhs;
rhs = null;
}
else
{
lhs = expressions.Pop();
}
expressions.Push(new Expression(lhs, rhs, op));
}
// Check correctness
override public string ToString()
{
string expression;
if (Object.ReferenceEquals(op, null))
{
return(solution.ToString());
}
expression = OperatorNames.OpenParenthesis + Left.ToString() + op.ToString();
if (!op.IsUnary())
{
expression += Right.ToString();
}
return(expression + OperatorNames.ClosedParenthesis);
}
