Acos

Beschreibung

Der Arkuskosinus wird durch die Funktion acos beschrieben. Sie erwartet einen Parameter und gibt den Wert an der Stelle zurück.

Syntax

acos(Gleitkommazahl zahl)

Parameter

• zahl - Ein Zahlenwert zwischen '-1' und '1'.

Return Value

• Gibt den Wert des Arkuskosinus an der Stelle zurück.

Beispiele

acos(1)    --> returns 0

JUnit Tests

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private double PI = Math.PI;

@Test
public void testAcos1() {
	assertEquals(0, Evaluator.getNumberResult("acos('1')", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcos2() {
	assertEquals(PI, Evaluator.getNumberResult("acos('-1')", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcos3() {
	assertEquals(PI / 2, Evaluator.getNumberResult("acos('0')", exerciseVariableMap, fillInVariableMap), 0.000001);
}

@Test
public void testAcos4() {
	assertEquals(PI / 2, Evaluator.getNumberResult("acos('0')", exerciseVariableMap, fillInVariableMap), 0.000001);
}

@Test
public void testAcos5() {
	assertEquals(0.795398830184144, Evaluator.getNumberResult("acos(0.7)", exerciseVariableMap, fillInVariableMap),
			0.0);
}

@Test
public void testAcosWithInput1() {
	assertEquals(PI / 2, Evaluator.getNumberResult("acos([pos=1])", exerciseVariableMap, fillInVariableMap),
			0.0001);
}

@Test
public void testAcosWithInput2() {
	assertEquals(0, Evaluator.getNumberResult("acos([pos=2])", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcosWithInput3() {
	assertEquals(PI, Evaluator.getNumberResult("acos([pos=3])", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcosWithVariables1() {
	assertEquals(PI / 2, Evaluator.getNumberResult("acos([var=a])", exerciseVariableMap, fillInVariableMap),
			0.000001);
}

@Test
public void testAcosWithVariables2() {
	assertEquals(0, Evaluator.getNumberResult("acos([var=b])", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcosWithVariables3() {
	assertEquals(PI, Evaluator.getNumberResult("acos([var=c])", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcosWithExpressions1() {
	assertEquals(0.861722668365136,
			Evaluator.getNumberResult("acos(acos(acos(0.7)))", exerciseVariableMap, fillInVariableMap), 0.0);
}

@Test
public void testAcosWithExpressions2() {
	assertEquals(PI / 2, Evaluator.getNumberResult("acos(acos(1))", exerciseVariableMap, fillInVariableMap), 0.0001);
}

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

@Test(expected = FunctionInvalidArgumentTypeException.class)
public void testAcosWithEmptyStringArgument() {
	Evaluator.getNumberResult("acos('')", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testAcosWithEmptyArgument() {
	Evaluator.getNumberResult("acos()", exerciseVariableMap, fillInVariableMap);
	fail();
}

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

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