CompareTo

Beschreibung

Die Funktion compareTo bestimmt wie sehr zwei Zeichenketten lexikografisch voneinander abweichen. Die Funktion erwartet zwei Strings und gibt eine Zahl zurück.

Syntax

compareTo(String zeichenkette1, String zeichenkette2)

Parameter

• zeichenkette1 - erste zu vergleichende Zeichenkette
• zeichenkette2 - zweite zu vergleichende Zeichenkette

Return Value

• Gibt eine Zahl zurück

Beispiele

compareTo('hallo','hallo')   --> returns 0
compareTo('hallo','JACK')   --> returns 30
compareTo('JACK','jack')   --> returns -32

JUnit Tests

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@BeforeClass
public static void beforeTest() {
	
		compareToFillInVariableMap.put(1, OMConverter.toObject("<OMOBJ><OMSTR>test</OMSTR></OMOBJ>"));

		compareToExerciseVariableMap.put("a", OMConverter.toObject("<OMOBJ><OMSTR>test</OMSTR></OMOBJ>"));
	
}

@Test
public void testCompareTo1() {
	assertEquals(0, Evaluator.getNumberResult("compareTo('Hallo','Hallo')", compareToExerciseVariableMap,
			compareToFillInVariableMap), 0.0);
}

@Test
public void testCompareTo2() {
	assertEquals(0, Evaluator.getNumberResult("compareTo('HAlLo','HAlLo')", compareToExerciseVariableMap,
			compareToFillInVariableMap), 0.0);
}

@Test
public void testCompareTo3() {
	assertTrue(0 < Evaluator.getNumberResult("compareTo('jack','JACK')", compareToExerciseVariableMap,
			compareToFillInVariableMap));
}

@Test
public void testCompareTo4() {
	assertTrue(0 < Evaluator.getNumberResult("compareTo('paluno','JACK')", compareToExerciseVariableMap,
			compareToFillInVariableMap));
}

@Test
public void testCompareTo5() {
	assertTrue(0 > Evaluator.getNumberResult("compareTo('JACK','paluno')", compareToExerciseVariableMap,
			compareToFillInVariableMap));
}

@Test
public void testCompareTo6() {
	assertNotEquals(0, Evaluator.getNumberResult("compareTo('2*x+2*y','2*(x+y)')", compareToExerciseVariableMap,
			compareToFillInVariableMap), 0.0);
}

@Test
public void testCompareToWithInput() {
	assertEquals(0, Evaluator.getNumberResult("compareTo('[pos=1]','test')", compareToExerciseVariableMap,
			compareToFillInVariableMap), 0.0);
}

@Test
public void testCompareToWithVariables() {
	assertEquals(0, Evaluator.getNumberResult("compareTo('[var=a]','test')", compareToExerciseVariableMap,
			compareToFillInVariableMap), 0.0);
}

@Test(expected = ParserException.class)
public void testCompareToWithWrongInputCharacter() {
	Evaluator.evaluate("compareTo(ab,'test')", compareToExerciseVariableMap, compareToFillInVariableMap);
	fail();
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testCompareToWithOneArgument() {
	Evaluator.evaluate("compareTo('Hallo')", compareToExerciseVariableMap, compareToFillInVariableMap);
	fail();
}

@Test
public void testCompareToWithOneRationalAndOneTextArgument() {
	assertNotEquals(Evaluator.getNumberResult("compareTo(12, 'rational')", compareToExerciseVariableMap, compareToFillInVariableMap),0.0);
}

@Test
public void testCompareToWithTwoRationalArguments() {
	assertNotEquals(0, Evaluator.getNumberResult("compareTo(1, 2)", compareToExerciseVariableMap, compareToFillInVariableMap),0.0);
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testCompareToWithThreeArguments() {
	Evaluator.evaluate("compareTo('hallo', 'hello', 'hillo')", compareToExerciseVariableMap,
			compareToFillInVariableMap);
	fail();
}

@Test(expected = UndefinedExerciseVariableException.class)
public void testCompareToWithMissingExcerciseVariable() {
	Evaluator.evaluate("compareTo('[var=j]', 'test')", compareToExerciseVariableMap, compareToFillInVariableMap);
	fail();
}

@Test(expected = UndefinedFillInVariableException.class)
public void testCompareToWithMissingInput() {
	Evaluator.evaluate("compareTo('[pos=42]', 'test')", compareToExerciseVariableMap, compareToFillInVariableMap);
	fail();
}

Hinweise

• Die Funktion unterscheidet zwischen Groß- und Kleinschreibung.
• Steht der erste String lexikografisch vor dem zweiten String, ist die Rückgabe negativ. Umgekehrt ist die Rückgabe entsprechend positiv.