Abs: Unterschied zwischen den Versionen
Zur Navigation springen
Zur Suche springen
Spobel (Diskussion | Beiträge) (→Syntax) |
|||
Zeile 3: | Zeile 3: | ||
=== Syntax === | === Syntax === | ||
abs( | abs([[Double]] zahl) | ||
=== Parameter === | === Parameter === |
Version vom 4. Oktober 2017, 12:43 Uhr
Beschreibung
Die Funktion abs berechnet den Betrag einer Zahl. Die Funktion erwartet eine Zahl als Parameter und gibt eine Zahl zurück.
Syntax
abs(Double zahl)
Parameter
- zahl - eine rationale Zahl, deren Betrag berechnet werden soll
Return Value
- Gibt eine Ganzzahl zurück
Beispiele
Standardfälle
abs(1) --> returns 1 abs(-2.5) --> returns 2.5 abs(-abs(5)) --> returns 5
Benutzung mit Variablen
abs('[pos=1]') abs('[var=a]')
JUnit Tests
[Anzeigen]
@Test
public void testAbs1() {
assertEquals(1, Evaluator.getNumberResult("abs(1)", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbs2() {
assertEquals(1, Evaluator.getNumberResult("abs('-1')", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbs3() {
assertEquals(0.5, Evaluator.getNumberResult("abs(-0.5)", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbs4() {
assertEquals(0, Evaluator.getNumberResult("abs(-0)", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbsWithInput1() {
assertEquals(1, Evaluator.getNumberResult("abs('[pos=2]')", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbsWithInput2() {
assertEquals(0, Evaluator.getNumberResult("abs('[pos=1]')", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbsWithVariables1() {
assertEquals(1, Evaluator.getNumberResult("abs('[var=b]')", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbsWithVariables2() {
assertEquals(0, Evaluator.getNumberResult("abs('[var=a]')", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbsWithExpressions1() {
assertEquals(5, Evaluator.getNumberResult("abs(-abs(5))", exerciseVariableMap, fillInVariableMap), 0);
}
@Test
public void testAbsWithExpressions2() {
assertEquals(5, Evaluator.getNumberResult("abs(-abs(abs(-5)))", exerciseVariableMap, fillInVariableMap), 0);
}
@Test(expected = FunctionInvalidArgumentTypeException.class)
public void testAbsWithWrongInputCharacter1() {
Evaluator.getNumberResult("abs(a)", exerciseVariableMap, fillInVariableMap);
fail();
}
@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testAbsWithTwoArguments1() {
Evaluator.getNumberResult("abs(-2.2, 3.3)", exerciseVariableMap, fillInVariableMap);
fail();
}
@Test(expected = FunctionInvalidNumberOfArgumentsException.class)
public void testAbsWithThreeArguments1() {
Evaluator.getNumberResult("abs(2.123, -3.55, -1)", exerciseVariableMap, fillInVariableMap);
fail();
}
@Test(expected = UndefinedExerciseVariableException.class)
public void testAbsWithMissingExcerciseVariable1() {
Evaluator.getNumberResult("abs('[var=j]')", exerciseVariableMap, fillInVariableMap);
fail();
}
@Test(expected = UndefinedFillInVariableException.class)
public void testAbsWithMissingInput1() {
Evaluator.getNumberResult("abs('[pos=42]')", exerciseVariableMap, fillInVariableMap);
fail();
}