/***************************************************************/
/* Verfasser: Prof. Dr. Gregor Büchel                          */
/* Source   : BigDez1.java                                     */  
/* Zweck    : BigDecimal-Arithmetik, NaKo bezeichnet die Anzahl*/
/*            der Nachkommastellen (scale)                     */
/* Stand    : 14.11.2005 / 30.11.2007                          */
/***************************************************************/

import java.math.*;

class BigDez1
{public static void main(String args[]) 
 {BigDecimal a, b, c=null;
  String as, bs;
  int na, nb, nc, w=1;
  char op;
  do
  {System.out.print("a  : ");
   as=IO1.einstring();
   System.out.print("OP : ");
   op=IO1.einchar();
   System.out.print("b  : ");
   bs=IO1.einstring();
   a=new BigDecimal(as);
   b=new BigDecimal(bs);
   na=a.scale();
   nb=b.scale();
   System.out.println(" ");
   System.out.println("a = "+a+" NaKo = "+na);
   System.out.println("b = "+b+" NaKo = "+nb);
   switch(op)
   {case '+': c=a.add(b);
              break;
    case '-': c=a.subtract(b);
              break;
    case '*': c=a.multiply(b);
              break;
    case '/': nc=10*(a.scale()+b.scale());
              c=a.divide(b,nc,4);
              break;
   }
   nc=c.scale();
   System.out.println("c = "+c+" NaKo = "+nc);
   do
   { System.out.println("Neue Skalierung des Ergebnisses? (NaKo >= 1 !)(ENDE: NAKO = -1");
     nc=IO1.einint();
     c=c.setScale(nc,4);
     System.out.println("c = "+c+" NaKo = "+nc);
   } while (nc!=-1);
   System.out.println("WEITERE Rechnungen ? (ja=1)");
   w=IO1.einint();
  } while(w==1);   
 }
}