46 lines
1.3 KiB
Java
46 lines
1.3 KiB
Java
package com.baeldung.maths;
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import java.math.BigDecimal;
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import org.junit.Assert;
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import org.junit.Test;
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public class FloatingPointArithmeticUnitTest {
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@Test
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public void givenDecimalNumbers_whenAddedTogether_thenGetExpectedResult() {
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double a = 13.22;
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double b = 4.88;
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double c = 21.45;
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double result = 39.55;
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double abc = a + b + c;
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double acb = a + c + b;
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Assert.assertEquals(result, abc, 0);
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Assert.assertNotEquals(result, acb, 0);
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double ab = 18.1;
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double ac = 34.67;
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double ab_c = ab + c;
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double ac_b = ac + b;
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Assert.assertEquals(result, ab_c, 0);
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Assert.assertNotEquals(result, ac_b, 0);
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BigDecimal d = new BigDecimal(String.valueOf(a));
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BigDecimal e = new BigDecimal(String.valueOf(b));
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BigDecimal f = new BigDecimal(String.valueOf(c));
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BigDecimal sum = new BigDecimal("39.55");
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BigDecimal def = d.add(e).add(f);
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BigDecimal dfe = d.add(f).add(e);
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Assert.assertEquals(0, def.compareTo(sum));
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Assert.assertEquals(0, dfe.compareTo(sum));
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Assert.assertNotEquals(0, sum.compareTo(new BigDecimal(String.valueOf(acb))));
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}
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}
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