ConvertToBinary

Beschreibung

Die Funktion convertToBinary wandelt Ganzzahlen und Gleitkommazahlen in ihre entsprechende Binärdarstellung um. Die Rückgabe ist eine Zeichenkette.

Negative Gleitkommazahlen werden nach dem IEEE_754 Standard konvertiert, d.h. es gibt immer 64 Stellen. Negative Ganzzahlen werden immer mit 32 Stellen dargestellt.

Syntax

convertToBinary(Ganzzahl zahl)

Parameter

• zahl - die Dezimaldarstellung der Zahl, die in Binär umgewandelt werden soll

Return Value

• Gibt eine Ganzzahl zurück

Beispiele

Standardfälle

 convertToBinary(15)   --> returns '1111'
 convertToBinary(3)    --> returns '11'
 convertToBinary(-3)   --> returns '11111111111111111111111111111101'
 convertToBinary(1.2)  --> returns '11111111110011001100110011001100110011001100110011001100110011'
 convertToBinary(-1.2) --> returns '1011111111110011001100110011001100110011001100110011001100110011'

Benutzung von Variablen

convertToBinary('[pos=1]')
convertToBinary('[var=a]')

JUnit Tests

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@BeforeClass
public static void beforeTest() {
	
		fillInVariableMap.put(2, OMConverter.toObject("<OMOBJ><OMI>7</OMI></OMOBJ>"));

		exerciseVariableMap.put("b", OMConverter.toObject("<OMOBJ><OMI>7</OMI></OMOBJ>"));
	
}

@Test
public void testConvertToBinary1() {
	assertEquals(OMCreator.createOMSTR("10"),
			Evaluator.evaluate("convertToBinary(2)", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test
public void testConvertToBinary2() {
	assertEquals(OMCreator.createOMSTR("1101101111"),
			Evaluator.evaluate("convertToBinary(879)", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test
public void testConvertToBinary3() {
	assertNotEquals(OMCreator.createOMSTR("-11"),
			Evaluator.evaluate("convertToBinary(-3)", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test
public void testConvertToBinaryWithInput1() {
	assertEquals(OMCreator.createOMSTR("111"),
			Evaluator.evaluate("convertToBinary([pos=2])", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test
public void testConvertToBinaryWithInput2() {
	assertEquals(OMCreator.createOMSTR("0"),
			Evaluator.evaluate("convertToBinary([pos=1])", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test
public void testConvertToBinaryWithVariables1() {
	assertEquals(OMCreator.createOMSTR("0"),
			Evaluator.evaluate("convertToBinary([var=a])", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test
public void testConvertToBinaryWithVariables2() {
	assertEquals(OMCreator.createOMSTR("111"),
			Evaluator.evaluate("convertToBinary([var=b])", exerciseVariableMap, fillInVariableMap).getOMSTR());
}

@Test(expected = FunctionInvalidArgumentTypeException.class)
public void testConvertToBinaryWithWrongInputCharacter() {
	Evaluator.evaluate("convertToBinary(a)", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testConvertToBinaryWithTwoArguments() {
	Evaluator.evaluate("convertToBinary(3, 2)", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testConvertToBinaryWithThreeArguments() {
	Evaluator.evaluate("convertToBinary(1, 2, 3)", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = UndefinedExerciseVariableException.class)
public void testConvertToBinaryWithMissingExcerciseVariable() {
	Evaluator.evaluate("convertToBinary([var=j])", exerciseVariableMap, fillInVariableMap);
	fail();
}

@Test(expected = UndefinedFillInVariableException.class)
public void testConvertToBinaryWithMissingInput() {
	Evaluator.evaluate("convertToBinary([pos=42])", exerciseVariableMap, fillInVariableMap);
	fail();
}

Hinweise

• Für negative Zahlen wird das Zweierkomplement zurückgegeben.