GetDenominator

Beschreibung

Mit der Funktion getDenominator erhält man den Nenner eines Bruches. Die Funktion erwartet einen String, bei dem es sich um einen Bruch handeln muss, und gibt eine Zahl zurück.

Syntax

getDenominator(String bruch)

Parameter

• bruch - der Bruch, dessen Nenner bestimmt werden soll

Return Value

• Gibt eine Ganzzahl zurück

Beispiele

getDenominator('3/5')   --> returns 5

JUnit Tests

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@Before 
public void beforeTest() {
  placeFillInVariable(1, OMParser.parse("0"));
  placeFillInVariable(2, OMParser.parse("20/3"));
  placeFillInVariable(3, OMParser.parse("10.3"));
  placeFillInVariable(4, OMParser.parse("-5"));
  placeFillInVariable(5, OMParser.parse("5"));
		
  placeExerciseVariable("a", OMParser.parse("0"));
  placeExerciseVariable("b", OMParser.parse("20/3"));
  placeExerciseVariable("c", OMParser.parse("10.3"));
  placeExerciseVariable("d", OMParser.parse("-5"));
  placeExerciseVariable("e", OMParser.parse("5"));
}

@Test
public void testGetDenominator(){
  assertTrue(7 == (getEvaluator().getNumberResult("getDenominator(3/7)")));
  assertTrue(7 == (getEvaluator().getNumberResult("getDenominator(10/7)")));
  assertTrue(-10 == (getEvaluator().getNumberResult("getDenominator(20/-10)"))); //Error negative denominator
  assertTrue(3.2 == (getEvaluator().getNumberResult("getDenominator('-5/3.2')")));
  assertTrue(5 == (getEvaluator().getNumberResult("getDenominator('0/5')")));
  assertFalse(3 == (getEvaluator().getNumberResult("getDenominator('-5/6')")));
  assertFalse(2 == (getEvaluator().getNumberResult("getDenominator('8/4')")));
}

@Test(expected=InvalidEvaluatorFunctionArgumentException.class)
public void testGetDenominatorAtDefinitionZero(){
  getEvaluator().getNumberResult("getDenominator(3/0)");  //Result of 3/0 is undefined
}

@Test
public void testGetDenominatorWithInput(){
  assertTrue(3 == (getEvaluator().getNumberResult("getDenominator([pos=2])")));
  assertTrue(7 == (getEvaluator().getNumberResult("getDenominator([pos=1]/7)")));
  assertTrue(10.3 == (getEvaluator().getNumberResult("getDenominator(5/[pos=3])"))); 
  assertTrue(5 == (getEvaluator().getNumberResult("getDenominator([pos=3]/[pos=5])")));
  assertTrue(-5 == (getEvaluator().getNumberResult("getDenominator([pos=3]/[pos=4])"))); //Error negative denominator
}

@Test
public void testGetDenominatorWithVariables(){
  assertTrue(3 == (getEvaluator().getNumberResult("getDenominator([var=b])")));
  assertTrue(7 == (getEvaluator().getNumberResult("getDenominator([var=a]/7)")));
  assertTrue(10.3 == (getEvaluator().getNumberResult("getDenominator(5/[var=c])"))); 
  assertTrue(5 == (getEvaluator().getNumberResult("getDenominator([var=c]/[var=e])")));
  assertTrue(-5 == (getEvaluator().getNumberResult("getDenominator([var=c]/[var=d])"))); //Error negative denominator
}
	
@Test
public void testGetDenominatorWithExpressions(){
  assertTrue(2 == (getEvaluator().getNumberResult("getDenominator('4/(getDenominator('3/2'))')")));
  assertTrue(5 == (getEvaluator().getNumberResult("getDenominator('4/(getDenominator('3/[pos=5]'))')")));
}
	
@Test(expected=InvalidEvaluatorFunctionArgumentException.class)
public void testGetDenominatorWithWrongInputPointNumber(){
  getEvaluator().getNumberResult("getDenominator('7.2')");
}

@Test(expected=InvalidEvaluatorFunctionArgumentException.class)
public void testGetDenominatorWithWrongInputCharacter(){
  getEvaluator().getNumberResult("getDenominator('a/3.3')");
}
	
@Test(expected=UnsupportedEvaluatorFunctionException.class)
public void testGetDenominatorWithTwoArguments(){
  getEvaluator().getNumberResult("getDenominator('7/3', '12/2')");
}

@Test(expected=UnsupportedEvaluatorFunctionException.class)
public void testGetDenominatorWithThreeArguments(){
  getEvaluator().getNumberResult("getDenominator('1/1', '3/9', '7/8')");
}

@Test(expected=UndefinedExerciseVariableException.class)
public void testGetDenominatorWithMissingExerciseVariable(){
  getEvaluator().getNumberResult("getDenominator('[var=j]/3')");
}

@Test(expected=UndefinedFillInVariableException.class)
public void testGetDenominatorWithMissingInput(){
  getEvaluator().getNumberResult("getDenominator('[pos=42]/3')");
}