Method extract

benchmark/bench/pidigits.java:99–104

(int j)

   }      

   public int extract(int j){
      BigInteger bigj = BigInteger.valueOf(j);
      BigInteger numerator = (q.multiply(bigj)).add(r);
      BigInteger denominator = (s.multiply(bigj)).add(t);                  
      return ( numerator.divide(denominator) ).intValue();                    
   }     

   public Transformation qrst(int q, int r, int s, int t){
      this.q = BigInteger.valueOf(q);