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BAEL-837 - Added jUnit test.

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This commit is contained in:
iaforek 2017-06-13 22:29:27 +01:00
parent c5f2fb5b2c
commit f6a39f84bb
2 changed files with 62 additions and 10 deletions
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27
core-java/src/main/java/com/baeldung/maths/FloatingPointArithmetic.java
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@ -13,30 +13,37 @@ public class FloatingPointArithmetic {
System.out.println("b = " + b); System.out.println("b = " + b);
System.out.println("c = " + c); System.out.println("c = " + c);
double ab = a + b; double sum_ab = a + b;
System.out.println("a + b = " + ab); System.out.println("a + b = " + sum_ab);
double abc = a + b + c; double abc = a + b + c;
System.out.println("a + b + c = " + abc); System.out.println("a + b + c = " + abc);
double ac = a + c; double ab_c = sum_ab + c;
System.out.println("a + c = " + ac); System.out.println("ab + c = " + ab_c);
double sum_ac = a + c;
System.out.println("a + c = " + sum_ac);
double acb = a + c + b; double acb = a + c + b;
System.out.println("a + c + b = " + acb); System.out.println("a + c + b = " + acb);
double ac_b = ac + b; double ac_b = sum_ac + b;
System.out.println("ac + b = " + ac_b); System.out.println("ac + b = " + ac_b);
double ab = 18.1;
double ac = 34.67;
double sum_ab_c = ab + c;
double sum_ac_b = ac + b;
System.out.println("ab + c = " + sum_ab_c);
System.out.println("ac + b = " + sum_ac_b);
BigDecimal d = new BigDecimal(String.valueOf(a)); BigDecimal d = new BigDecimal(String.valueOf(a));
BigDecimal e = new BigDecimal(String.valueOf(b)); BigDecimal e = new BigDecimal(String.valueOf(b));
BigDecimal f = new BigDecimal(String.valueOf(c)); BigDecimal f = new BigDecimal(String.valueOf(c));
BigDecimal def; BigDecimal def = d.add(e).add(f);
BigDecimal dfe; BigDecimal dfe = d.add(f).add(e);
def = d.add(e).add(f);
dfe = d.add(f).add(e);
System.out.println("d + e + f = " + def); System.out.println("d + e + f = " + def);
System.out.println("d + f + e = " + dfe); System.out.println("d + f + e = " + dfe);

45
core-java/src/test/java/com/baeldung/maths/FloatingPointArithmeticTest.java Normal file
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@ -0,0 +1,45 @@
package com.baeldung.maths;
import java.math.BigDecimal;
import org.junit.Assert;
import org.junit.Test;
public class FloatingPointArithmeticTest {
@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))));
}
}