C# Klassen Beispiel Bruchrechnung

using System;

public class Bruch {

      int zaehler,                 // wird automatisch mit 0 initialisiert

          nenner = 1;

      string etikett = "";    // die Ref.typ-Init. auf null wird ersetzt, siehe Text

      public Bruch(int zpar, int npar, string epar) {

            zaehler = zpar;

            Nenner  = npar;

            etikett = epar;

      }

      public Bruch() {}

      public int Zaehler {

            get {

                  return zaehler;

            }

            set {

                  zaehler = value;

            }

      }

      public int Nenner {

            get {

                  return nenner;

            }

            set {

                  if (value != 0)

                        nenner = value;

            }

      }

      public string Etikett {

            get {

                  return etikett;

            }

            set {

                  if (value.Length <= 40)

                        etikett = value;

                  else

                        etikett = value.Substring(0, 40);

            }

      }

    public void Kuerze() {

        // größten gemeinsamen Teiler mit dem Euklids Algorithmus bestimmen

        // (performante Variante mit Modulo-Operator)

        if (zaehler != 0) {

            int rest;

            int ggt = Math.Abs(zaehler);

            int divisor = Math.Abs(nenner);

            do {

                rest = ggt % divisor;

                ggt = divisor;

                divisor = rest;

            } while (rest > 0);

            zaehler /= ggt;

            nenner /= ggt;

        }

    }

    public void Addiere(Bruch b) {

          zaehler = zaehler*b.nenner + b.zaehler*nenner;

          nenner = nenner*b.nenner;

          Kuerze();

    }

      public bool Addiere(int zpar, int npar, bool autokurz) {

            if (npar != 0) {

                  zaehler = zaehler * npar + zpar * nenner;

                  nenner = nenner * npar;

                  if (autokurz)

                        Kuerze();

                  return true;

            } else

                  return false;

      }

      public bool Frage() {

            try {

                  Console.Write("Zaehler: ");

                  int z  = Convert.ToInt32(Console.ReadLine());

                  Console.Write("Nenner : ");

                  int n = Convert.ToInt32(Console.ReadLine());

                  Zaehler = z;

                  Nenner = n;

                  return true;

            } catch {

                  return false;

            }

      }

     

      public void Zeige() {

            string luecke = "";

            for (int i=1; i <= etikett.Length; i++)

                  luecke = luecke + " ";

            Console.WriteLine(" {0}   {1}\n {2} -----\n {0}   {3}\n",

                              luecke, zaehler, etikett, nenner);

/*          int ll = Math.Max(zaehler.ToString().Length,

                                  nenner.ToString().Length);

            for (int i=1; i <= ll; i++)

                  strich = strich + "-";

            Console.WriteLine(" {0} {1}\n {2} {3}\n {0} {4}\n",

                              luecke, zaehler, etikett, strich, nenner);

*/

      }

}

ANWENDUNG

using System;
class BruchRechnung {
    static void Main() {
        Bruch b1 = new Bruch(1, 2, "b1 = ");
      
        Bruch b2 = new Bruch();
        b1.Zeige();
        b2.Zeige();
        Console.ReadLine();
        b1.Frage();
        b1.Zeige();
      
       
       
    }
}