Corrections

// Multiple choice quiz // The Question constructor function function Question(question, correctAnswer) { var args = Question.arguments; this.question = question; this.correctAnswer = correctAnswer; this.userAnswer = null; this.isCorrect = isCorrect; this.showForm = showForm; this.userChoices = new Array(); for (var i = 0; i < args.length - 2; i++) { this.userChoices[i] = args[i + 2]; } } // Method to determine if question is answered correctly function isCorrect() { if (this.correctAnswer == this.userAnswer) { return true; } else { return false; } } // Method to display contents of Question object function showForm(n) { document.write((n + 1) + '. ' + this.question + '

'); for (var i = 0; i < this.userChoices.length; i++) { document.write(''); document.write(' ' + this.userChoices[i] + '
'); } document.write('

'); } // Function to correct the quiz and display score and correct answers function correctQuiz() { // Initialize correct and start correctPage string var correct = 0; var correctPage = 'Corrections' + ''; // Loop through Question objects, call isCorrect(), and count // correct answers for (var i = 0; i < quiz.length; i++) { if (quiz[i].isCorrect()) { correct++; } } // Compute the score and add it to the correctPage string var score = Math.round((correct / quiz.length) * 100); correctPage += 'Score: ' + score + ' %'; // If there are incorrect answers, list the correct ones if (correct < quiz.length) { correctPage += "

Here are the correct answers to the "; correctPage += "questions you got wrong:

"; for (var i = 0; i < quiz.length; i++) { if (!quiz[i].isCorrect()) { correctPage += (i + 1) + '. ' + quiz[i].userChoices[quiz[i].correctAnswer] + '
'; } } } else { // Otherwise, offer congratulations correctPage += "

Well done, you aced it.

"; } // Finish correctPage, create a new window, and display correctPage correctPage += ''; var correctWin = window.open('', '', 'height=200,width=300,scrollbars=yes'); correctWin.document.write(correctPage); correctWin.document.close(); } // Create Question objects var quiz = new Array(); quiz[0] = new Question( "From the mid-19th century through the 1980s, thousands of young Basques came to the American West to herd:", 2, // Correct answer "Cows", // Choice 0 "Pigs", // Choice 1 "Sheep", // Choice 2 "Llamas"); // Choice 3 quiz[1] = new Question( "Reasons for their immigration were:", 3, "Political", "Cultural", "Economic", "All of the above"); quiz[2] = new Question( "The herder lived alone on the range with two dogs, a horse or a donkey, and:", 2, "about 100 sheep", "about 500 sheep", "about 1,500 sheep", "about 5,000 sheep"); quiz[3] = new Question( "Among sheepherders it was a custom to carve pictures, messages, and thoughts on:", 1, "sidewalks", "the bark of aspen trees", "wooden boxes", "cement walls"); quiz[4] = new Question( "Tree carvings are also called:", 1, "petroglyphs", "arborglyphs or dendroglyphs", "pictographs"); quiz[5] = new Question( "Basque sheepherders carved onto the aspens mostly:", 2, "phone numbers", "answers to quizzes", "names and dates"); quiz[6] = new Question( "The languages in which the Basque sheepherders carved their words were:", 4, "Spanish", "Basque", "French", "English", "All"); quiz[7] = new Question( "Peavine Mountain was used as a summer rangeland for sheep as far back as:", 3, "the 1920s", "the 1900s", "the 1880s", "the 1860s"); quiz[8] = new Question( "Three main groves on Peavine Mountain contain:", 2, "about 100 trees carved by 25 carvers", "about 250 trees carved by 50 carvers", "about 500 trees carved by 105 carvers", "about 1000 trees carved by 250 carvers"); quiz[9] = new Question( "Aspen trees generally live to be about:", 1, "75 years old", "100 years old", "150 years old", "200 years old");