public string Evaluate(string expression)
{
IOperand result;
try
{
var infixExpression = parser.Parse(expression);
var postfixExpression = postfixConverter.ConvertInfixToPostix(infixExpression);
result = postfixCalculator.EvaluateExpression(postfixExpression);
}
catch (Exception ex)
{
return(ex.Message);
}
return(result.Value.ToString());
}
