Round

Beschreibung

Die Funktion round rundet eine Gleitkommazahl zu einer Ganzzahl. Die Funktion erwartet eine Zahl und gibt die nächst gelegene Ganzzahl zurück.

Syntax

round(float zahl)

Parameter

• zahl - die zu rundene Zahl

Return Value

• Gibt die gerundete Ganzzahl zurück

Beispiele

Standardfälle

round(12.4)   --> returns 12
round(15.678)   --> returns 16

Benutzung mit Variablen

round([pos=1])
round([var=a])

JUnit Tests

@Test public void testRound(){
  assertTrue(6 == getEvaluator().getNumberResult("round(6.3)"));
  assertTrue(93 == getEvaluator().getNumberResult("round(93.49999)"));
  assertTrue(94 == getEvaluator().getNumberResult("round(93.50001)"));
  assertTrue(-93 == getEvaluator().getNumberResult("round(-93.49999)"));
  assertTrue(-94 == getEvaluator().getNumberResult("round(-93.50001)"));
 
  assertTrue(4 == getEvaluator().getNumberResult("round(3.5)"));
  assertTrue(3 == getEvaluator().getNumberResult("round(2.5)"));
}

@Test public void testRoundWithInput(){
  assertTrue(4 == getEvaluator().getNumberResult("round([pos=4])"));
  assertTrue(93 == getEvaluator().getNumberResult("round([pos=93])"));
}

@Test public void testRoundWithVariable(){
  assertTrue(4 == getEvaluator().getNumberResult("round([var=a])"));
  assertTrue(93 == getEvaluator().getNumberResult("round([var=b])"));
}
	
@Test
public void testRoundWithPointNumbers(){
  assertTrue(0 == getEvaluator().getNumberResult("round(.2)"));
  assertTrue(0 == getEvaluator().getNumberResult("round(-.2)"));
}
	
@Test
public void testRoundWithExpressions(){
  assertTrue(-2 == getEvaluator().getNumberResult("round(round(-2.2))"));
  assertTrue(2 == getEvaluator().getNumberResult("round(round(round(2.1)))"));
}
	
@Test(expected=InvalidEvaluatorFunctionArgumentException.class)
public void testRoundWithWrongInputCharacter(){
  getEvaluator().getNumberResult("round(a)");
}

@Test(expected=UnsupportedEvaluatorFunctionException.class)
public void testRoundWithTwoArguments(){
  getEvaluator().getNumberResult("round(1.2, 1.3)");
}

@Test(expected=UnsupportedEvaluatorFunctionException.class)
public void testRoundWithThreeArguments(){
  getEvaluator().getNumberResult("round(2.1, 2.2, 2.3)");
}

@Test(expected=UndefinedExerciseVariableException.class)
public void testRoundWithMissingExerciseVariable(){
  getEvaluator().getNumberResult("round('[var=j]')");
}

@Test(expected=UndefinedFillInVariableException.class)
public void testRoundWithMissingInput(){
  getEvaluator().getNumberResult("round('[pos=42]')");
}