1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.math.util;
18  
19  import static org.junit.Assert.assertEquals;
20  import static org.junit.Assert.assertFalse;
21  import static org.junit.Assert.assertTrue;
22  
23  import java.math.BigDecimal;
24  import java.math.BigInteger;
25  import java.math.MathContext;
26  
27  import org.apache.commons.math.TestUtils;
28  import org.junit.Test;
29  
30  public class BigRealTest {
31  
32      @Test
33      public void testConstructor() {
34          assertEquals(1.625, new BigReal(new BigDecimal("1.625")).doubleValue(), 1.0e-15);
35          assertEquals(-5.0, new BigReal(new BigInteger("-5")).doubleValue(), 1.0e-15);
36          assertEquals(-5.0, new BigReal(new BigInteger("-5"), MathContext.DECIMAL64).doubleValue(), 1.0e-15);
37          assertEquals(0.125, new BigReal(new BigInteger("125"), 3).doubleValue(), 1.0e-15);
38          assertEquals(0.125, new BigReal(new BigInteger("125"), 3, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
39          assertEquals(1.625, new BigReal(new char[] { '1', '.', '6', '2', '5' }).doubleValue(), 1.0e-15);
40          assertEquals(1.625, new BigReal(new char[] { 'A', 'A', '1', '.', '6', '2', '5', '9' }, 2, 5).doubleValue(), 1.0e-15);
41          assertEquals(1.625, new BigReal(new char[] { 'A', 'A', '1', '.', '6', '2', '5', '9' }, 2, 5, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
42          assertEquals(1.625, new BigReal(new char[] { '1', '.', '6', '2', '5' }, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
43          assertEquals(1.625, new BigReal(1.625).doubleValue(), 1.0e-15);
44          assertEquals(1.625, new BigReal(1.625, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
45          assertEquals(-5.0, new BigReal(-5).doubleValue(), 1.0e-15);
46          assertEquals(-5.0, new BigReal(-5, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
47          assertEquals(-5.0, new BigReal(-5l).doubleValue(), 1.0e-15);
48          assertEquals(-5.0, new BigReal(-5l, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
49          assertEquals(1.625, new BigReal("1.625").doubleValue(), 1.0e-15);
50          assertEquals(1.625, new BigReal("1.625", MathContext.DECIMAL64).doubleValue(), 1.0e-15);
51      }
52  
53      @Test
54      public void testCompareTo() {
55          BigReal first = new BigReal(1.0 / 2.0);
56          BigReal second = new BigReal(1.0 / 3.0);
57          BigReal third = new BigReal(1.0 / 2.0);
58  
59          assertEquals(0, first.compareTo(first));
60          assertEquals(0, first.compareTo(third));
61          assertEquals(1, first.compareTo(second));
62          assertEquals(-1, second.compareTo(first));
63  
64      }
65  
66      public void testAdd() {
67          BigReal a = new BigReal("1.2345678");
68          BigReal b = new BigReal("8.7654321");
69          assertEquals(9.9999999, a.add(b).doubleValue(), 1.0e-15);
70      }
71  
72      public void testSubtract() {
73          BigReal a = new BigReal("1.2345678");
74          BigReal b = new BigReal("8.7654321");
75          assertEquals( -7.5308643, a.subtract(b).doubleValue(), 1.0e-15);
76      }
77  
78      public void testDivide() {
79          BigReal a = new BigReal("1.0000000000");
80          BigReal b = new BigReal("0.0009765625");
81          assertEquals(1024.0, a.divide(b).doubleValue(), 1.0e-15);
82      }
83  
84      public void testMultiply() {
85          BigReal a = new BigReal("1024.0");
86          BigReal b = new BigReal("0.0009765625");
87          assertEquals(1.0, a.multiply(b).doubleValue(), 1.0e-15);
88      }
89  
90      @Test
91      public void testDoubleValue() {
92          assertEquals(0.5, new BigReal(0.5).doubleValue(), 1.0e-15);
93      }
94  
95      @Test
96      public void testBigDecimalValue() {
97          BigDecimal pi = new BigDecimal("3.1415926535897932384626433832795028841971693993751");
98          assertEquals(pi, new BigReal(pi).bigDecimalValue());
99          assertEquals(new BigDecimal(0.5), new BigReal(1.0 / 2.0).bigDecimalValue());
100     }
101 
102     @Test
103     public void testEqualsAndHashCode() {
104         BigReal zero = new BigReal(0.0);
105         BigReal nullReal = null;
106         assertTrue(zero.equals(zero));
107         assertFalse(zero.equals(nullReal));
108         assertFalse(zero.equals(Double.valueOf(0)));
109         BigReal zero2 = new BigReal(0.0);
110         assertTrue(zero.equals(zero2));
111         assertEquals(zero.hashCode(), zero2.hashCode());
112         BigReal one = new BigReal(1.0);
113         assertFalse((one.equals(zero) || zero.equals(one)));
114         assertTrue(one.equals(BigReal.ONE));
115     }
116 
117     public void testSerial() {
118         BigReal[] Reals = {
119             new BigReal(3.0), BigReal.ONE, BigReal.ZERO,
120             new BigReal(17), new BigReal(Math.PI),
121             new BigReal(-2.5)
122         };
123         for (BigReal Real : Reals) {
124             assertEquals(Real, TestUtils.serializeAndRecover(Real));
125         }
126     }
127 
128 }