public void Start()
{
Console.WriteLine("Formel eingeben:");
string eingabe = Console.ReadLine(); // "2 + 2"
Formel x = parser.Parse(eingabe);
var ergebnis = rechner.Rechne(x);
Console.WriteLine($"Das Ergebnis is {ergebnis}");
}
public Formel Parse(String input)
{
Formel output = new Formel();
var match = Regex.Match(input, @"(\d+)\s*(\D)\s*(\d+)"); //TODO: regex
output.Operand1 = Convert.ToInt32(match.Groups[1].Value);
output.Operand2 = Convert.ToInt32(match.Groups[3].Value);
output.Operator = match.Groups[2].Value[0];
return(output);
}
public Formel Parse(String input)
{
Formel output = new Formel();
string[] operanden = input.Split('+'); //TODO: regex
output.Operand1 = Convert.ToInt32(operanden[0]);
output.Operand2 = Convert.ToInt32(operanden[1]);
output.Operator = '+';
return(output);
}
public int Rechne(Formel formel)
{
foreach (IRechenOperation o in operationen)
{
if (o.Operator == formel.Operator)
{
return(o.Berechne(formel));
}
}
throw new ArgumentException("Operator unbekannt");
}
public int Rechne(Formel formel)
{
if (formel.Operator == '+')
{
return(formel.Operand1 + formel.Operand2);
}
else if (formel.Operator == '-')
{
return(formel.Operand1 - formel.Operand2);
}
else
{
throw new ArgumentException("Operator unbekannt");
}
}
public int Berechne(Formel f)
{
return(f.Operand1 * f.Operand2);
}