public int Evaluate()
{
int value1 = _expr1.Evaluate();
int value2 = _expr2.Evaluate();
return(value1 - value2);
}
static void Main(string[] args)
{
var parser = new Parser();
var commands = new string[]
{
"+ 5 6",
"- 6 5",
"+ - 4 5 6",
"+ 4 - 5 6",
"+ - + - - 2 3 4 + - -5 6 + -7 8 9 10"
};
foreach (var command in commands)
{
ExpressionBase.IExpressionBase expression = parser.Parse(command);
Console.WriteLine("{0} = {1}", expression, expression.Evaluate());
}
}