Reals


1   /* @author rich
2    * Created on 05-Mar-2004
3    *
4    * This code is covered by a Creative Commons
5    * Attribution, Non Commercial, Share Alike license
6    * <a HREF="http://creativecommons.org/licenses/by-nc-sa/1.0">License</a>
7    */
8   package org.lsmp.djep.groupJep.groups;
9   import org.lsmp.djep.groupJep.interfaces.*;
10  
11  /**
12   * @author Rich Morris
13   * Created on 05-Mar-2004
14   */
15  public class Reals extends Group implements FieldI,OrderedSetI,HasPowerI {
16  
17      private Double   ZERO = new Double  (0.0);
18      private Double   ONE = new Double  (1.0);
19  
20      /**
21       * Operations on the reals (Implemented as Doubles  
22       */
23      public Reals() {
24      }
25  
26      public Number   getZERO() {
27          return ZERO;
28      }
29  
30      public Number   getONE() {
31          return ONE;
32      }
33  
34      public Number   getInverse(Number   num) {
35          return new Double  (1.0/num.doubleValue());
36      }
37  
38      public Number   getMulInverse(Number   num) {
39          return new Double  (1.0 / num.doubleValue());
40      }
41  
42      public Number   add(Number   a, Number   b) {
43          return new Double  (a.doubleValue()+b.doubleValue());
44      }
45  
46      public Number   sub(Number   a, Number   b) {
47          return new Double  (a.doubleValue()-b.doubleValue());
48      }
49  
50      public Number   mul(Number   a, Number   b) {
51          return new Double  (a.doubleValue()*b.doubleValue());
52      }
53  
54      public Number   div(Number   a, Number   b) {
55          return new Double  (a.doubleValue()/b.doubleValue());
56      }
57  
58      public Number   pow(Number   a, Number   b) {
59          return new Double  (Math.pow(a.doubleValue(),b.doubleValue()));
60      }
61  
62      public Number   valueOf(String   str) {
63          return new Double  (str);
64      }
65  
66      public boolean equals(Number   a,Number   b)    {
67          return ((Double  ) a).compareTo((Double  ) b) == 0;
68      }
69      
70      public int compare(Number   a,Number   b)   {
71          return ((Double  ) a).compareTo((Double  ) b);
72      }
73  }
74
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