Abs

Beschreibung

Die Funktion abs berechnet den Betrag einer Zahl. Die Funktion erwartet eine Zahl als Parameter und gibt eine Zahl zurück.

Syntax

abs(Gleitkommazahl zahl)

Parameter

• zahl - eine rationale Zahl, deren Betrag berechnet werden soll

Return Value

• Gibt den Betrag zurück

Beispiele

Standardfälle

abs(1)         --> returns 1
abs(-2.5)      --> returns 2.5
abs(-abs(5))   --> returns 5

Benutzung mit Variablen

abs([pos=1])
abs([var=a])

JUnit Tests

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@Test
public void testAbs1() {
	assertEquals(1, Evaluator.getNumberResult("abs(1)", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbs2() {
	assertEquals(1, Evaluator.getNumberResult("abs('-1')", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbs3() {
	assertEquals(0.5, Evaluator.getNumberResult("abs(-0.5)", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbs4() {
	assertEquals(0, Evaluator.getNumberResult("abs(-0)", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbsWithInput1() {
	assertEquals(1, Evaluator.getNumberResult("abs('[pos=2]')", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbsWithInput2() {
	assertEquals(0, Evaluator.getNumberResult("abs('[pos=1]')", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbsWithVariables1() {
	assertEquals(1, Evaluator.getNumberResult("abs('[var=b]')", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbsWithVariables2() {
	assertEquals(0, Evaluator.getNumberResult("abs('[var=a]')", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbsWithExpressions1() {
	assertEquals(5, Evaluator.getNumberResult("abs(-abs(5))", exerciseVariableMap, fillInVariableMap), 0);
}

@Test
public void testAbsWithExpressions2() {
	assertEquals(5, Evaluator.getNumberResult("abs(-abs(abs(-5)))", exerciseVariableMap, fillInVariableMap), 0);
}

@Test(expected = FunctionInvalidArgumentTypeException.class)
public void testAbsWithWrongInputCharacter1() {
	Evaluator.getNumberResult("abs(a)", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testAbsWithTwoArguments1() {
	Evaluator.getNumberResult("abs(-2.2, 3.3)", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testAbsWithThreeArguments1() {
	Evaluator.getNumberResult("abs(2.123, -3.55, -1)", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = UndefinedExerciseVariableException.class)
public void testAbsWithMissingExcerciseVariable1() {
	Evaluator.getNumberResult("abs('[var=j]')", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = UndefinedFillInVariableException.class)
public void testAbsWithMissingInput1() {
	Evaluator.getNumberResult("abs('[pos=42]')", exerciseVariableMap, fillInVariableMap);
	fail();
}