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