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Example Application: Boolean Algebra

     

Description

This example explores the button side of a check box. The application is an exercise on Boolean algebra (it includes only the AND and the OR operations).

       

ApplicationApplication: Creating the Application

  1. Start Microsoft Visual Studio
  2. To start a new application, on the main menu, click File -> New Project...
  3. In the middle list, click Windows Application
  4. Set the name to BooleanAlgebra1
  5. Click OK
  6. Design the form as follows:
     
    Control Text Name Font FlatStyle Appearance
    Label A   Microsoft Sans Serif, 24pt    
    Label B   Microsoft Sans Serif, 24pt    
    Label A ^ B lblOperation Microsoft Sans Serif, 24pt    
    CheckBox False chkOperand1 Microsoft Sans Serif, 18pt System Button
    CheckBox False chkOperand2 Microsoft Sans Serif, 18pt System Button
    CheckBox False chkResult Microsoft Sans Serif, 18pt System Button
    Button New Operation btnNewOperation Microsoft Sans Serif, 15.75pt    
    Button Check btnCheckOperation Microsoft Sans Serif, 18pt    
    Button Close btnClose Microsoft Sans Serif, 15.75pt    
  7. Double-click the top-left check box and implement its event as follows:
     
    private void chkOperand1_CheckedChanged(object sender, EventArgs e)
    {
            if (chkOperand1.Checked == true)
                    chkOperand1.Text = "True";
            else
                    chkOperand1.Text = "False";
    }
  8. Return to the form
  9. Double-click the top-center check box and implement its event as follows:
     
    private void chkOperand2_CheckedChanged(object sender, EventArgs e)
    {
            if (chkOperand2.Checked == true)
                    chkOperand2.Text = "True";
            else
                    chkOperand2.Text = "False";
    }
  10. Return to the form
  11. Double-click the top-right check box and implement its event as follows:
     
    private void chkResult_CheckedChanged(object sender, EventArgs e)
    {
            if (chkResult.Checked == true)
                    chkResult.Text = "True";
            else
                    chkResult.Text = "False";
    }
  12. Return to the form
  13. Double-click the New Operation button and implement its event as follows:
     
    private void btnNewOperation_Click(object sender, EventArgs e)
    {
            string[] strBooleanValues = { "True", "False" };
            string[] strOperations = { "A ^ B", "A V B" };
            Random rnd = new Random();
    
            chkOperand1.Text = strBooleanValues[rnd.Next(2)];
            chkOperand2.Text = strBooleanValues[rnd.Next(2)];
    
            if (chkOperand1.Text == "True")
                    chkOperand1.Checked = true;
            else
                    chkOperand1.Checked = false;
    
            if (chkOperand2.Text == "True")
                    chkOperand2.Checked = true;
            else
                    chkOperand2.Checked = false;
    
            lblOperation.Text = strOperations[rnd.Next(2)];
    
  14. Return to the form
  15. Double-click the Check button and implement its event as follows:
    private void btnCheckResult_Click(object sender, EventArgs e)
    {
            // Logical Conjunction
            if (lblOperation.Text == "A ^ B")
            {
                    // If A = true
                    if (chkOperand1.Checked == true)
                    {
                        if (chkOperand2.Checked == true)
                        {
                            if (chkResult.Checked == true)
                            {
                                // | A | B | A ^ B |
                                // | T | T |   T   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else  if (chkResult.Checked == false)
                            {
                                // | A | B | A ^ B |
                                // | T | T |   F   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                        else if (chkOperand2.Checked == false)
                        {
                            if (chkResult.Checked == false)
                            {
                                // | A | B | A ^ B |
                                // | T | F |   F   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else  if (chkResult.Checked == true)
                            {
                                // | A | B | A ^ B |
                                // | T | F |   T   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                    }
                    else  if( chkOperand1.Checked == false )
                    {
                        if (chkOperand2.Checked == true)
                        {
                            if (chkResult.Checked == false)
                            {
                                // | A | B | A ^ B |
                                // | F | T |   F   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else  if (chkResult.Checked == true )
                            {
                                // | A | B | A ^ B |
                                // | F | T |   T   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                        else  if (chkOperand2.Checked == false)
                        {
                            if (chkResult.Checked == false)
                            {
                                // | A | B | A ^ B |
                                // | F | F |   F   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else  if (chkResult.Checked == true)
                            {
                                // | A | B | A ^ B |
                                // | F | F |   T   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                    }
                }
                else if (lblOperation.Text == "A V B") // Logical Disjunction:
                {
                    // If A = true
                    if (chkOperand1.Checked == true)
                    {
                        if (chkOperand2.Checked == true)
                        {
                            if (chkResult.Checked == true)
                            {
                                // | A | B | A V B |
                                // | T | T |   T   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else if (chkResult.Checked == false)
                            {
                                // | A | B | A V B |
                                // | T | T |   F   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                        else if (chkOperand2.Checked == false)
                        {
                            if (chkResult.Checked == true)
                            {
                                // | A | B | A V B |
                                // | T | F |   T   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else if (chkResult.Checked == false)
                            {
                                // | A | B | A V B |
                                // | T | F |   F   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                    }
                    else if (chkOperand1.Checked == false)
                    {
                        if (chkOperand2.Checked == true)
                        {
                            if (chkResult.Checked == true)
                            {
                                // | A | B | A V B |
                                // | F | T |   T   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else if (chkResult.Checked == false)
                            {
                                // | A | B | A V B |
                                // | F | T |   F   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                        else if (chkOperand2.Checked == false)
                        {
                            if (chkResult.Checked == false)
                            {
                                // | A | B | A V B |
                                // | F | F |   F   |
                                MessageBox.Show("Bravo - Good Answer");
                            }
                            else if (chkResult.Checked == true)
                            {
                                // | A | B | A V B |
                                // | F | F |   T   |
                                MessageBox.Show("Wrong - Get it right next time!");
                            }
                        }
                    }
            }
    }
  16. Return to the form
  17. Double-click the Close button and implement its event as follows:
    private void btnClose_Click(object sender, EventArgs e)
    {
            Close();
    }
  18. Return to the form
 

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