NumberOfVariables

Beschreibung

Die Funktion numberOfVariables zählt die Variablen in einem Ausdruck. Sie erwartet einen String und gibt einen numerischen Ausdruck zurück.

Syntax

numberOfVariables(Expression term)

Parameter

• term - der Ausdruck dessen Variablen gezählt werden sollen

Return Value

• Gibt einen numerischen Ausdruck zurück.

Beispiele

numberOfVariables('2x+3a-2b')    --> returns 3

JUnit Tests

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@BeforeClass
public static void beforeTest() throws FunctionNotImplementedException, UndefinedFillInVariableException,
		UndefinedExerciseVariableException, ParserException, ErroneousFillInVariableException, ErroneousExerciseVariableException {
	numberOfVariablesFillInVariableMap.put(1, ExpressionParser.parse("0", null, null));
	numberOfVariablesFillInVariableMap.put(2, ExpressionParser.parse("3", null, null));
	numberOfVariablesFillInVariableMap.put(3, ExpressionParser.parse("x", null, null));

	numberOfVariablesExerciseVariableMap.put("a", ExpressionParser.parse("x", null, null));
	numberOfVariablesExerciseVariableMap.put("b", ExpressionParser.parse("3", null, null));
}

@Test
public void testNumberOfVariables1() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2x+3a-x+2b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariables2() {
	assertEquals(1, Evaluator.getNumberResult("numberOfVariables('2x+3x-x+2x')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariables3() {
	assertEquals(5, Evaluator.getNumberResult("numberOfVariables('sin(i)*E^(e)+ q/sqrt(s)')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariables4() {
	assertEquals(0, Evaluator.getNumberResult("numberOfVariables('5')", numberOfVariablesExerciseVariableMap,
			numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithInput1() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2*x+3*a-x+2*b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithInput2() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2*[pos=3]+3*a-[pos=3]+2*b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithInput3() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2*[pos=3]+3*a-[pos=3]+2*b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithInput4() {
	assertEquals(2, Evaluator.getNumberResult("numberOfVariables('2*[pos=3]+3*[pos=3]-[pos=3]+2*b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithVariables1() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2x+3a-x+2b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithVariables2() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2[var=a]+3a-[var=a]+2b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithVariables3() {
	assertEquals(3, Evaluator.getNumberResult("numberOfVariables('2[var=a]+3a-[var=a]+2b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithVariables4() {
	assertEquals(2, Evaluator.getNumberResult("numberOfVariables('2[var=a]+3[var=a]-[var=a]+2b')",
			numberOfVariablesExerciseVariableMap, numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithONECharacter() {
	assertEquals(1, Evaluator.getNumberResult("numberOfVariables(a)", numberOfVariablesExerciseVariableMap,
			numberOfVariablesFillInVariableMap), 0.0);
}

@Test
public void testNumberOfVariablesWithEmptyStringArguments() {
	Evaluator.getNumberResult("numberOfVariables('')", numberOfVariablesExerciseVariableMap,
			numberOfVariablesFillInVariableMap);
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testNumberOfVariablesWithEmptyArgument() {
	Evaluator.getNumberResult("numberOfVariables()", numberOfVariablesExerciseVariableMap,
			numberOfVariablesFillInVariableMap);
	fail();
}

@Test(expected = UndefinedExerciseVariableException.class)
public void testNumberOfVariablesWithMissingExerciseVariable() {
	Evaluator.getNumberResult("numberOfVariables('[var=j]')", numberOfVariablesExerciseVariableMap,
			numberOfVariablesFillInVariableMap);
	fail();
}

@Test(expected = UndefinedFillInVariableException.class)
public void testNumberOfVariablesWithMissingInput() {
	Evaluator.getNumberResult("numberOfVariables('[pos=42]')", numberOfVariablesExerciseVariableMap,
			numberOfVariablesFillInVariableMap);
	fail();
}