NumberOfVariables
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Beschreibung
Die Funktion numberOfVariables zählt die Variablen in einem Ausdruck. Sie erwartet einen String und gibt einen numerischen Ausdruck zurück.
Syntax
numberOfVariables(Expression term)
Parameter
- term - der Ausdruck dessen Variablen gezählt werden sollen
Return Value
- Gibt einen numerischen Ausdruck zurück.
Beispiele
numberOfVariables('2x+3a-2b') --> returns 3
JUnit Tests
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@Before
public void beforeTest() {
placeFillInVariable(1, OMParser.parse("0"));
placeFillInVariable(2, OMParser.parse("3"));
placeFillInVariable(5, OMParser.parse("x"));
placeExerciseVariable("a", OMParser.parse("x"));
placeExerciseVariable("b", OMParser.parse("3"));
}
@Test
public void testNumberOfVariables() {
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2x+3a-x+2b')"));
assertTrue(1 == getEvaluator().getNumberResult("numberOfVariables('2x+3x-x+2x')"));
assertTrue(4 == getEvaluator().getNumberResult("numberOfVariables('sin(i)*E^(e)+ q/sqrt(s)')"));
assertTrue(0 == getEvaluator().getNumberResult("numberOfVariables('5')"));
}
@Test
public void testNumberOfVariablesWithInput() {
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2x+3a-x+2b')"));
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2[pos=5]+3a-[pos=5]+2b')"));
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2[pos=5]+3a-[pos=5]+2b')"));
assertTrue(2 == getEvaluator().getNumberResult("numberOfVariables('2[pos=5]+3[pos=5]-[pos=5]+2b')"));
}
@Test
public void testNumberOfVariablesWithVariables() {
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2x+3a-x+2b')"));
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2[var=a]+3a-[var=a]+2b')"));
assertTrue(3 == getEvaluator().getNumberResult("numberOfVariables('2[var=a]+3a-[var=a]+2b')"));
assertTrue(2 == getEvaluator().getNumberResult("numberOfVariables('2[var=a]+3[var=a]-[var=a]+2b')"));
}
@Test
public void testNumberOfVariablesWithONECharacter(){
assertTrue(1 == getEvaluator().getNumberResult("numberOfVariables(a)"));
}
@Test(expected=InvalidCASFunctionArgumentException.class)
public void testNumberOfVariablesWithEmptyStringArguments(){
getEvaluator().getNumberResult("numberOfVariables('')");
}
@Test(expected=InvalidCASFunctionArgumentException.class)
public void testNumberOfVariablesWithEmptyArgument(){
getEvaluator().getNumberResult("numberOfVariables()");
}
@Test(expected=UndefinedExerciseVariableException.class)
public void testNumberOfVariablesWithMissingExerciseVariable(){
getEvaluator().getNumberResult("numberOfVariables('[var=j]')");
}
@Test(expected=UndefinedFillInVariableException.class)
public void testNumberOfVariablesWithMissingInput(){
getEvaluator().getNumberResult("numberOfVariables('[pos=42]')");
}