Example Application: Elementary Addition

	Example Application: Elementary Addition

Description

This small application can help you check your ability to perform simple additions of natural numbers (integers between 0 and 99).

Application: Introducing Text Boxes

Create a Window Forms Application named ElementaryAddition2

Design the form as follows:

Control	Text	Name	TextAlign	Font	Additional Properties
Label	00	lblOperand1	Center	Name: Tahoma Size: 48 Bold: True	AutoSize: True ForeColor: Blue
Label	+		Center	Name: Arial Size: 50 Bold: True	AutoSize: True ForeColor: Maroon
Label	00	lblOperand2	Center	Name: Tahoma Size: 48 Bold: True	AutoSize: True ForeColor: Blue
Label	=		Center	Name: Arial Size: 50 Bold: True	AutoSize: True ForeColor: Green
TextBox	000	txtResult	Center	Name: Tahoma Size: 48 Bold: True
Label	New Operation	lblNewOperation	Center	Name: Tahoma, Size: 28 Bold: True	AutoSize: True BorderStyle: Fixed3D ForeColor: White BackColor:Maroon
Label	Check	lblCheckAnswer	Center	Name: Tahoma, Size: 28 Bold: True	AutoSize: True BorderStyle: Fixed3D ForeColor: White BackColor:Maroon
Label	Quit	lblQuit	Center	Name: Tahoma, Size: 28 Bold: True	AutoSize: True BorderStyle: FixedSingle

Double-click the New Operation label and implement its event as follows:

private void lblNewOperation_Click(object sender, EventArgs e)
{
        int operand1;
        int operand2;

        Random rnd = new Random();

        operand1 = rnd.Next(99);
        operand2 = rnd.Next(99);
        int result = operand1 + operand2;

        lblOperand1.Text = operand1.ToString();
        lblOperand2.Text = operand2.ToString();
        txtResult.Text   = "";
        txtResult.Focus();
}

Return to the form and double-click the Check label

Implement its event as follows:

private void lblCheckAnswer_Click(object sender, EventArgs e)
{
        int Operand1 = 0;
        int Operand2 = 0;
        int Result = 0;

        try
        {
                Operand1 = int.Parse(lblOperand1.Text);
        }
        catch (FormatException)
        {
                MessageBox.Show("Invalid Value");
        }

        try
        {
                Operand2 = int.Parse(lblOperand2.Text);
        }
        catch (FormatException)
        {
                MessageBox.Show("Invalid Value");
        }

        try
        {
                Result = int.Parse(txtResult.Text);
        }
        catch (FormatException)
        {
                MessageBox.Show("Invalid Answer");
        }

        if (Result == (Operand1 + Operand2))
                MessageBox.Show("WOW - Good Answer");
        else
                MessageBox.Show("PSSST - Wrong Answer");

        lblNewOperation_Click(sender, e);
}

Return to the form and double-click Quit

Implement its event as follows:

private void lblQuit_Click(object sender, EventArgs e)
{
            Close();
}

Execute the application and test it
Click the Close button to close the form and return to your programming environment


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