Plus

Beschreibung

Bei der Addition werden zwei Zahlen miteinander addiert.

Syntax

a + b

Parameter

• a - double
• b - double

Return Value

• Gibt eine expression zurück.

Beispiele

<math>3+5</math>    --> returns 8

<math>\frac{1}{2} + \frac{3}{2}</math>    --> returns 2

JUnit Tests

@Before 
public void beforeTest() {
  placeFillInVariable(1, OMParser.parse("3"));
  placeFillInVariable(2, OMParser.parse("10"));
  placeFillInVariable(3, OMParser.parse("3.5"));
		
  placeExerciseVariable("a", OMParser.parse("3"));
  placeExerciseVariable("b", OMParser.parse("10"));
  placeExerciseVariable("c", OMParser.parse("3.5"));
}

@Test
public void testAddition(){
  assertTrue(10 == getEvaluator().getNumberResult("6+4"));
  assertTrue(10.2 == getEvaluator().getNumberResult("7.3+2.9"));
  assertTrue(1 == getEvaluator().getNumberResult("0.5 + 0.5"));
  assertTrue(11 == getEvaluator().getNumberResult("0.5 + 0.5 + 10"));
}
	
@Test
public void testAdditionWithNegativeNumber(){
  assertTrue(4.4 == getEvaluator().getNumberResult("7.3+(-2.9)"));
  assertTrue(-5.3 == getEvaluator().getNumberResult("-7.3+2"));
  assertTrue(-8 == getEvaluator().getNumberResult("-2+(-6)"));
}
	
@Test
public void testAdditionWithVariables(){
  assertTrue(9 == getEvaluator().getNumberResult("6+[var=a]"));
  assertTrue(12.9 == getEvaluator().getNumberResult("[var=b]+2.9"));
  assertTrue(10.5 == getEvaluator().getNumberResult("[var=c]+7"));
}
	
@Test
public void testAdditionWithInput(){
  assertTrue(9 == getEvaluator().getNumberResult("6+[pos=1]"));
  assertTrue(12.9 == getEvaluator().getNumberResult("[pos=2]+2.9"));
  assertTrue(10.5 == getEvaluator().getNumberResult("[pos=3]+7"));
}
	
@Test
public void testAdditionWithEncapsulation(){
  assertTrue(3 == getEvaluator().getNumberResult("1 + (1 + 1)"));
  assertTrue(4 == getEvaluator().getNumberResult("1 + (1 + (1 + 1))"));
  assertTrue(6 == getEvaluator().getNumberResult("1 + (1 + (1 + (1 + (1 + 1))))"));
  assertTrue(6 == getEvaluator().getNumberResult("((((1 + 1) + 1) + 1) + 1) + 1"));
}

@Test(expected=ParserMismatchException.class)
public void testAdditionWithWrongInputCharacter() {
  getEvaluator().getNumberResult("6 + a");
}
	
@Test(expected=UnsupportedBinaryOperatorException.class)//es fliegt eine EvaluatorException
public void testAdditionWithWrongInputString() {
  getEvaluator().getNumberResult("6 + 'a'");
}
	
@Test (expected=UndefinedExerciseVariableException.class)
public void testAdditionWithMissingExcerciseVariable() {
  getEvaluator().getNumberResult("[var=j] + 1");
}
	
@Test (expected=UndefinedFillInVariableException.class)
public void testAdditionWithMissingInput() {
  getEvaluator().getNumberResult("[pos=42] + 1");
}

Hinweise

• Mit equal ("==") lässt sich das Ergebnis anschließend vergleichen.