create an GUI Programme.

The local driver's license office has asked you to create an application that grades the written portion of the driver's license exam, The exam has 20 multiple choice questions. Here are the correct answers:

1.B

2.D

3.A

4.A

5.C

6.A

7.B

8.A

9.C

10.D

11.B

12.C

13.D

14.A

15.D

16.C

17.C

18.B

19.D

20.A

Your GUI program should stores these correct answers in an array.

The program should read the student's answers for each of the 20 questions from a text file and store the answers in another array. (Create your own text file to test the application.)

After the student's answers have been read from the file, the program should display a message indicating whether the student passed or failed the exam. (A student must correctly answer 15 of the 20 questions to pass the exam).

It should then display the total number of correctly answered questions, the total number of incorrectly answered questions, and a list showing the question numbers of the incorrectly answered questions.

Here's some basic code to do that.

It's assumed that the student will enter the full path to his/her answers file in textBox1 and will then press button1 for the answers to be marked.

It's also assumed that the file contains exactly 20 answers (no question numbers) on separate lines, in the same order as the questions, and that there are no blank lines:

using System.IO; // add this using directive to the others

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private string[] correctAnswers;

private void Form1_Load(object sender, EventArgs e)

{

correctAnswers = new string[] { "B", "D", "A", "A", "C", "A", "B", "A", "C", "D", "B", "C", "D", "A", "D", "C", "C", "B", "D", "A" };

}

private void button1_Click(object sender, EventArgs e)

{

string[] answers = null;

if (File.Exists(textBox1.Text))

{

answers = File.ReadAllLines(textBox1.Text);

if (answers.Length != 20)

{

MessageBox.Show("There should be exactly 20 answers in the file");

textBox1.Focus();

return;

}

List incorrect = new List();

for (int i = 0; i < 20; i++)

{

string answer = answers[i].Trim().ToUpper();

if (answer != "A" && answer != "B" && answer != "C" && answer != "D")

{

string error = String.Format("Answer for question {0} is invalid", i + 1);

MessageBox.Show(error);

textBox1.Focus();

return;

}

if (answer != correctAnswers[i]) incorrect.Add(i + 1);

}

int numCorrect = 20 - incorrect.Count;

string status = (numCorrect >= 15) ? "Congratulations, you passed!" : "Sorry, you failed";

string message = String.Format("{0}\n\nTotal correct {1}\n\nTotal incorrect {2}\n\n", status, numCorrect, 20 - numCorrect);

message += "The following questions were incorrect:\n\n";

message += String.Join(", ", incorrect.ToArray());

MessageBox.Show(message);

}

else

{

MessageBox.Show("The file does not exist");

textBox1.Focus();

}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
Accepted answer
Here's some basic code to do that.

It's assumed that the student will enter the full path to his/her answers file in textBox1 and will then press button1 for the answers to be marked.

It's also assumed that the file contains exactly 20 answers (no question numbers) on separate lines, in the same order as the questions, and that there are no blank lines:

using System.IO; // add this using directive to the others

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private string[] correctAnswers;

private void Form1_Load(object sender, EventArgs e)
{
correctAnswers = new string[] { "B", "D", "A", "A", "C", "A", "B", "A", "C", "D", "B", "C", "D", "A", "D", "C", "C", "B", "D", "A" };
}

private void button1_Click(object sender, EventArgs e)
{
string[] answers = null;
if (File.Exists(textBox1.Text))
{
answers = File.ReadAllLines(textBox1.Text);
if (answers.Length != 20)
{
MessageBox.Show("There should be exactly 20 answers in the file");
textBox1.Focus();
return;
}

List incorrect = new List();

for (int i = 0; i < 20; i++)
{
string answer = answers[i].Trim().ToUpper();
if (answer != "A" && answer != "B" && answer != "C" && answer != "D")
{
string error = String.Format("Answer for question {0} is invalid", i + 1);
MessageBox.Show(error);
textBox1.Focus();
return;
}

if (answer != correctAnswers[i]) incorrect.Add(i + 1);
}

int numCorrect = 20 - incorrect.Count;
string status = (numCorrect >= 15) ? "Congratulations, you passed!" : "Sorry, you failed";
string message = String.Format("{0}\n\nTotal correct {1}\n\nTotal incorrect {2}\n\n", status, numCorrect, 20 - numCorrect);
message += "The following questions were incorrect:\n\n";
message += String.Join(", ", incorrect.ToArray());
MessageBox.Show(message);
}
else
{
MessageBox.Show("The file does not exist");
textBox1.Focus();
}
}
}

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