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).

Practical Learning: 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