public string Visit(BinaryOperation expression)
{
expression._left.Accept(this);
_expression = _expression + expression._symbol;
expression._right.Accept(this);
return(_expression);
}
static void Main()
{
IExpression expression = new BinaryOperation(new Brackets(new BinaryOperation(new Literal(10), new Literal(2), "*")), new Literal(67), "+");
IExpression newExpression = new BinaryOperation(new Brackets(new BinaryOperation(new Literal(10), new Literal(2), "*")), new Brackets(new BinaryOperation(new Literal(1000), new Literal(500), "/")), "-");
PrintExpression _printExpression = new PrintExpression();
expression.Accept(_printExpression);
Console.WriteLine("Выражение: {0}", _printExpression._expression);
_printExpression._expression = "";
newExpression.Accept(_printExpression);
Console.WriteLine("Выражение: {0}", _printExpression._expression);
Console.ReadKey();
}