001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.math.util;
018
019 import static org.junit.Assert.assertEquals;
020 import static org.junit.Assert.assertFalse;
021 import static org.junit.Assert.assertTrue;
022
023 import java.math.BigDecimal;
024 import java.math.BigInteger;
025 import java.math.MathContext;
026
027 import org.apache.commons.math.TestUtils;
028 import org.junit.Test;
029
030 public class BigRealTest {
031
032 @Test
033 public void testConstructor() {
034 assertEquals(1.625, new BigReal(new BigDecimal("1.625")).doubleValue(), 1.0e-15);
035 assertEquals(-5.0, new BigReal(new BigInteger("-5")).doubleValue(), 1.0e-15);
036 assertEquals(-5.0, new BigReal(new BigInteger("-5"), MathContext.DECIMAL64).doubleValue(), 1.0e-15);
037 assertEquals(0.125, new BigReal(new BigInteger("125"), 3).doubleValue(), 1.0e-15);
038 assertEquals(0.125, new BigReal(new BigInteger("125"), 3, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
039 assertEquals(1.625, new BigReal(new char[] { '1', '.', '6', '2', '5' }).doubleValue(), 1.0e-15);
040 assertEquals(1.625, new BigReal(new char[] { 'A', 'A', '1', '.', '6', '2', '5', '9' }, 2, 5).doubleValue(), 1.0e-15);
041 assertEquals(1.625, new BigReal(new char[] { 'A', 'A', '1', '.', '6', '2', '5', '9' }, 2, 5, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
042 assertEquals(1.625, new BigReal(new char[] { '1', '.', '6', '2', '5' }, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
043 assertEquals(1.625, new BigReal(1.625).doubleValue(), 1.0e-15);
044 assertEquals(1.625, new BigReal(1.625, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
045 assertEquals(-5.0, new BigReal(-5).doubleValue(), 1.0e-15);
046 assertEquals(-5.0, new BigReal(-5, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
047 assertEquals(-5.0, new BigReal(-5l).doubleValue(), 1.0e-15);
048 assertEquals(-5.0, new BigReal(-5l, MathContext.DECIMAL64).doubleValue(), 1.0e-15);
049 assertEquals(1.625, new BigReal("1.625").doubleValue(), 1.0e-15);
050 assertEquals(1.625, new BigReal("1.625", MathContext.DECIMAL64).doubleValue(), 1.0e-15);
051 }
052
053 @Test
054 public void testCompareTo() {
055 BigReal first = new BigReal(1.0 / 2.0);
056 BigReal second = new BigReal(1.0 / 3.0);
057 BigReal third = new BigReal(1.0 / 2.0);
058
059 assertEquals(0, first.compareTo(first));
060 assertEquals(0, first.compareTo(third));
061 assertEquals(1, first.compareTo(second));
062 assertEquals(-1, second.compareTo(first));
063
064 }
065
066 public void testAdd() {
067 BigReal a = new BigReal("1.2345678");
068 BigReal b = new BigReal("8.7654321");
069 assertEquals(9.9999999, a.add(b).doubleValue(), 1.0e-15);
070 }
071
072 public void testSubtract() {
073 BigReal a = new BigReal("1.2345678");
074 BigReal b = new BigReal("8.7654321");
075 assertEquals( -7.5308643, a.subtract(b).doubleValue(), 1.0e-15);
076 }
077
078 public void testDivide() {
079 BigReal a = new BigReal("1.0000000000");
080 BigReal b = new BigReal("0.0009765625");
081 assertEquals(1024.0, a.divide(b).doubleValue(), 1.0e-15);
082 }
083
084 public void testMultiply() {
085 BigReal a = new BigReal("1024.0");
086 BigReal b = new BigReal("0.0009765625");
087 assertEquals(1.0, a.multiply(b).doubleValue(), 1.0e-15);
088 }
089
090 @Test
091 public void testDoubleValue() {
092 assertEquals(0.5, new BigReal(0.5).doubleValue(), 1.0e-15);
093 }
094
095 @Test
096 public void testBigDecimalValue() {
097 BigDecimal pi = new BigDecimal("3.1415926535897932384626433832795028841971693993751");
098 assertEquals(pi, new BigReal(pi).bigDecimalValue());
099 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 }