/// <summary>
/// evaluate textual or single choice answer
/// </summary>
/// <param name="answer">answer to evaluate</param>
/// <returns>calculated number of points for the answer</returns>
private int EvaluateTextualOrSingleChoiceAnswer(TestSubmissionAnswer answer)
{
if (answer.Text == answer.Question.CorrectAnswer)
{
return(answer.Question.Points);
}
else
{
return(0);
}
}
/// <summary>
/// evaluate answer with multiple answer choices
/// </summary>
/// <param name="answer">answer to evaluate</param>
/// <returns>calculated number of points for the answer</returns>
private int EvaluateMultipleChoiceAnswer(TestSubmissionAnswer answer)
{
var correctAnswers = QuestionWithChoicesTools.GetCorrectAnswersLetters(answer.Question);
var submittedAnswers = QuestionWithChoicesTools.GetSubmittedAnswersLetters(answer);
var allPossibleAnswers = QuestionWithChoicesTools.GetAnswerChoicesLetters(answer.Question);
int correct = 0;
foreach (var possibleAnswer in allPossibleAnswers)
{
if (IsAnswerLetterCorrect(possibleAnswer, correctAnswers, submittedAnswers))
{
correct++;
}
}
double correctRatio = (double)correct / allPossibleAnswers.Length;
return((int)Math.Round(correctRatio * answer.Question.Points));
}
/// <inheritdoc/>
public void UpdateAnswerProperties(TestSubmissionAnswer answerToEvaluate, int updatedPoints, string updatedComment)
{
answerToEvaluate.Points = updatedPoints;
answerToEvaluate.Comment = updatedComment;
}
/// <summary>
/// get letters of all submitted answer choices in the <paramref name="answer"/>
/// </summary>
/// <param name="answer">given answer</param>
/// <returns></returns>
public static string[] GetSubmittedAnswersLetters(TestSubmissionAnswer answer)
{
return(answer.Text.Split(answerLetterDelimiter, StringSplitOptions.RemoveEmptyEntries).TrimAll());
}
public QuestionWithChoicesToolsTests()
{
exampleQuestion = new TestQuestion(1, string.Empty, $"A{ald} B", 1, QuestionType.MultipleChoice);
exampleAnswer = new TestSubmissionAnswer(exampleQuestion, $"A{ald}C");
}
