Divide

Beschreibung

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

Syntax

a/b
divide(a,b)

Parameter

• a - Gleitkommazahl
• b - Gleitkommazahl

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

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@BeforeClass
public static void beforeTest() {
	fillInVariableMap.put(1, OMConverter.toObject("<OMOBJ><OMI>3</OMI></OMOBJ>"));
	exerciseVariableMap.put("a", OMConverter.toObject("<OMOBJ><OMI>3</OMI></OMOBJ>"));
}

@Test
public void testDivision1() {
	assertEquals(2, Evaluator.getNumberResult("8/4", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivision2() {
	assertEquals(0.25, Evaluator.getNumberResult("1/4", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivision3() {
	assertEquals(0.75, Evaluator.getNumberResult("1.5/2", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test(expected = FunctionInvalidArgumentException.class)
public void testDivision4() {
	Evaluator.getNumberResult("1/0", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test
public void testDivisionWithVariables1() {
	assertEquals(1, Evaluator.getNumberResult("[var=a]/3", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithVariables2() {
	assertEquals(1, Evaluator.getNumberResult("3/[var=a]", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithInput1() {
	assertEquals(1, Evaluator.getNumberResult("[pos=1]/3", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithInput2() {
	assertEquals(1, Evaluator.getNumberResult("3/[pos=1]", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithNegativeNumbers1() {
	assertEquals(-.5, Evaluator.getNumberResult("-1 / 2", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithNegativeNumbers2() {
	assertEquals(-.5, Evaluator.getNumberResult("1 / -2", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithNegativeNumbers3() {
	assertEquals(-2, Evaluator.getNumberResult("-1 / 0.5", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithNegativeNumbers4() {
	assertEquals(2, Evaluator.getNumberResult("2.22 / 1.11", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithEncapsulation1() {
	assertEquals(2, Evaluator.getNumberResult("1 / (1 / 2)", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithEncapsulation2() {
	assertEquals(.5, Evaluator.getNumberResult("1 / (1 / (1 / 2))", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testDivisionWithEncapsulation3() {
	assertEquals(.5,
			Evaluator.getNumberResult("1 / (1 / (1 / (1 / (1 / 2))))", exerciseVariableMap, fillInVariableMap),
			0.0);
}

@Test
public void testDivisionWithEncapsulation4() {
	assertEquals(.5,
			Evaluator.getNumberResult("((((1 / 2) / 1) / 1) / 1) / 1", exerciseVariableMap, fillInVariableMap),
			0.0);
}

@Test
public void testDivisionWithInputCharacter() {
	OMA result = Evaluator.evaluate("6 / a", exerciseVariableMap, fillInVariableMap).getOMA();
	assertEquals("<OMA><OMS name=\"divide\" cd=\"arith1\"/><OMI>6</OMI><OMV name=\"a\"/></OMA>", result.toString());
}

@Test(expected = FunctionInvalidArgumentTypeException.class)
public void testDivisionWithWrongInputString() {
	Evaluator.getNumberResult("6 / 'aabcd'", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = UndefinedExerciseVariableException.class)
public void testDivisionWithMissingExcerciseVariable() {
	Evaluator.getNumberResult("[var=j] / 2", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = UndefinedFillInVariableException.class)
public void testDivisionWithMissingInput() {
	Evaluator.getNumberResult("[pos=42] / 2", exerciseVariableMap, fillInVariableMap);
	fail();
}

Hinweise

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