Lösung 2017-So-GA2-A3

public class IBANPruefziffer{
  public static void main(String[] args)  {
    long blz = 21050170L;
    long ktNr = 12345678L;
    long pz = berechnePruefziffer(blz, ktNr);
    System.out.println(pz);
  }
 
  public static long berechnePruefziffer(long blz, long ktNr)  {
    while(blz >= 97)    {
      blz = blz - 97;
    }
    ktNr = ktNr * 1000000;
    ktNr = ktNr + 131400;
 
    while(ktNr >= 88529281)    {
      ktNr = ktNr - 88529281;
    }
    while(ktNr >= 97)    {
      ktNr = ktNr - 97;
    }
    long pz = blz * 62 + ktNr;
    while(pz >= 97)    {
      pz = pz - 97;
    }
    pz = 98 - pz;
    return pz;
  }
}