Divide

Beschreibung

Bei der Division wird die eine Zahl durch die andere Zahl geteilt, z.B. .

Syntax

a/b

Parameter

• a - double
• b - double

Return Value

• Gibt eine expresseion zurück

Beispiele

<math>\frac{1}{4}</math>    --> returns 0.25

<math>\frac{1.5}{2}</math>    --> returns 0.75

JUnit Tests

@Before 
public void beforeTest() {
  placeFillInVariable(1, OMParser.parse("3"));
  placeFillInVariable(2, OMParser.parse("10"));
		
  placeExerciseVariable("a", OMParser.parse("3"));
  placeExerciseVariable("b", OMParser.parse("10"));
}
	
@Test
public void testDivision(){
  assertTrue(2 == getEvaluator().getNumberResult("8/4"));
  assertTrue(0.25 == getEvaluator().getNumberResult("1/4"));
  assertTrue(0.75 == getEvaluator().getNumberResult("1.5/2"));
  assertTrue("NaN".equals(getEvaluator().getNumberResult("1/0")));
}

@Test
public void testDivisionWithVariables(){
  assertTrue(1 == getEvaluator().getNumberResult("[var=a]/3"));
  assertTrue(.1 == getEvaluator().getNumberResult("1/[var=b]"));
}
	
@Test
public void testDivisionWithInput(){
  assertTrue(1 == getEvaluator().getNumberResult("[pos=1]/3"));
  assertTrue(.1 == getEvaluator().getNumberResult("1/[pos=2]"));
}
	
@Test
public void testDivisionWithNegativeNumbers(){
  assertTrue(-.5 == getEvaluator().getNumberResult("-1 / 2"));
  assertTrue(-.5 == getEvaluator().getNumberResult("1 / -2"));
  assertTrue(-2 == getEvaluator().getNumberResult("-1 / 0.5"));
  assertTrue(2 == getEvaluator().getNumberResult("2.22 / 1.11"));
}
	
@Test
public void testDivisionWithEncapsulation(){
  assertTrue(2 == getEvaluator().getNumberResult("1 / (1 / 2)"));
  assertTrue(.5 == getEvaluator().getNumberResult("1 / (1 / (1 / 2))"));
  assertTrue(.5 == getEvaluator().getNumberResult("1 / (1 / (1 / (1 / (1 / 2))))"));
  assertTrue(.5 == getEvaluator().getNumberResult("((((1 / 2) / 1) / 1) / 1) / 1"));
}

@Test(expected=ParserMismatchException.class)
public void testDivisionWithWrongInputCharacter() {
  getEvaluator().getNumberResult("6 / a");
}
	
@Test(expected=UnsupportedBinaryOperatorException.class)
public void testDivisionWithWrongInputString() {
  getEvaluator().getNumberResult("6 / 'a'");
}
	
@Test (expected=UndefinedExerciseVariableException.class)
public void testDivisionWithMissingExcerciseVariable() {
  getEvaluator().getNumberResult("[var=j] / 2");
}
	
@Test (expected=UndefinedFillInVariableException.class)
public void testDivisionWithMissingInput() {
  getEvaluator().getNumberResult("[pos=42] / 2");
}

Hinweise

• Das Ergebnis lässt sich mit equal ("==") vergleichen.