Ejemplo n.º 1
0
        public override float GetScore(UserAnswer userAnswer)
        {
            var choiceAnswer = userAnswer as ChoiceUserAnswer;

            if (choiceAnswer == null)
            {
                throw new WrongAnswerTypeException("Wrong answer type");
            }

            if (choiceAnswer.QuestionId != QuestionId)
            {
                throw new Exception("Answer.QuestionId doesn't match UserAnswer.QuestionId");
            }

            if (NumericValue == choiceAnswer.Value)
            {
                return(MaxScore);
            }

            if (AllValidChoicesRequired)
            {
                return(0f);
            }

            int userAnswerNumericValue    = choiceAnswer.Value;
            int answerNumericValue        = NumericValue;
            int numberOfValidChoices      = 0;
            int numberOfUsersValidChoices = 0;

            while (answerNumericValue != 0)
            {
                bool isChoiceValid     = (answerNumericValue & 1) == 1;
                bool isUserChoiceValid = (userAnswerNumericValue & 1) == 1;

                if (isUserChoiceValid && !isChoiceValid)
                {
                    return(0f);
                }

                if (isChoiceValid)
                {
                    numberOfValidChoices++;
                    if (isUserChoiceValid)
                    {
                        numberOfUsersValidChoices++;
                    }
                }

                userAnswerNumericValue >>= 1;
                answerNumericValue     >>= 1;
            }

            if (userAnswerNumericValue != 0)
            {
                return(0f);
            }

            return(MaxScore - MaxScore / numberOfValidChoices * (numberOfValidChoices - numberOfUsersValidChoices));
        }
Ejemplo n.º 2
0
        public override float GetScore(UserAnswer userAnswer)
        {
            var writtenAnswer = userAnswer as WrittenUserAnswer;

            if (writtenAnswer == null)
            {
                throw new WrongAnswerTypeException("Wrong answer type");
            }

            if (writtenAnswer.QuestionId != QuestionId)
            {
                throw new Exception("Answer.QuestionId doesn't match UserAnswer.QuestionId");
            }

            return(writtenAnswer.Value == Value ? MaxScore : 0);
        }
Ejemplo n.º 3
0
 public AnswerPair(UserAnswer userAnswer, Answer answer)
 {
     UserAnswer = userAnswer;
     Answer     = answer;
 }
Ejemplo n.º 4
0
 public void AddAnswerPair(UserAnswer userAnswer, Answer answer)
 {
     answerPairs.Add(new AnswerPair(userAnswer, answer));
 }