Tan

Beschreibung

Der Tangens wird durch die Funktion tan beschrieben. Sie erwartet einen Parameter und gibt einen Wert zurück.

Syntax

tan(String zeichenkette)

Parameter

• zeichenkette - ein Wert im Bogenmaß

Return Value

• Gibt den Wert des Tangens an der Stelle zurück.

Beispiele

tan('Pi/4')    --> returns 1

tan('0')    --> 0

JUnit Tests

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@BeforeClass
public static void beforeTest() {
	fillInVariableMap.put(2, OMCreator.createOMOBJ(OMSymbol.NUMS1_PI));
}

@Test
public void testTan1() {
	assertEquals(0, Evaluator.getNumberResult("tan('0')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTan2() {
	assertEquals(0, Evaluator.getNumberResult("tan('[var=PI]')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTan3() {
	assertEquals(0, Evaluator.getNumberResult("tan('-[var=PI]')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTan4() {
	assertEquals(1, Evaluator.getNumberResult("tan('[var=PI]/4')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTan5() {
	assertEquals(-1, Evaluator.getNumberResult("tan('-[var=PI]/4')", exerciseVariableMap, fillInVariableMap),
			0.0001);
}

@Test
public void testTanWithInput1() {
	assertEquals(0, Evaluator.getNumberResult("tan('[pos=1]')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTanWithInput2() {
	assertEquals(1, Evaluator.getNumberResult("tan('[pos=2]/4')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTanWithVariables1() {
	assertEquals(0, Evaluator.getNumberResult("tan('[var=a]')", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTanWithVariables2() {
	assertEquals(1, Evaluator.getNumberResult("tan('[var=PI]/4')", exerciseVariableMap, fillInVariableMap), 0.0001); // Rounding
																														// Error
}

@Test
public void testTanWithExpressions1() {
	assertEquals(0, Evaluator.getNumberResult("tan(tan(0))", exerciseVariableMap, fillInVariableMap), 0.0001);
}

@Test
public void testTanWithExpressions2() {
	assertEquals(0, Evaluator.getNumberResult("tan(tan(tan(0)))", exerciseVariableMap, fillInVariableMap), 0.0001);
}

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

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

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

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

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

Hinweise

• Berechnet nur den Tangens mit Werten im Bogenmaß. Der Gradmaß muss ggf. vorher umgewandelt werden.