static void Main(string[] args)
{
var showHelp = false;
var p = new OptionSet()
{
{
"h|help", "show this message and exit",
v => showHelp = v != null
}
};
try
{
p.Parse(args);
}
catch (OptionException e)
{
Console.Write("bundling: ");
Console.WriteLine(e.Message);
Console.WriteLine("Try `greet --help' for more information.");
return;
}
if (showHelp || args.Length == 0)
{
ShowHelp(p);
return;
}
var expressionProcessor = new MathExpressionProcessor();
var mapper = new NotationMapper(expressionProcessor);
var calculator = new Calculator(expressionProcessor);
var expression = string.Join(" ", args);
try
{
var expressionInReversePolishNotation = mapper.ReversePolishNotation(expression);
var computedValue = calculator.CalculateFromReversePolishNotation(expressionInReversePolishNotation);
Console.Write(computedValue);
}
catch (Exception e)
{
Console.Write("ERROR: " + e.Message);
}
}
public NotationMapper(MathExpressionProcessor expressionProcessor)
{
ExpressionProcessor = expressionProcessor;
}
public Calculator(MathExpressionProcessor expressionProcessor)
{
ExpressionProcessor = expressionProcessor;
}
