Microsoft Visual J# Tutorials - Using Radio Buttons

Calculations With Radio Buttons

This exercise combines labels, panels, radio buttons, and text boxes to create an application. It illustrates how to use radio buttons as regular buttons

Prerequisites:
Panel
Button
Scroll Bars

Start Microsoft Visual J# and create a Windows Application named Calculation

Design the form as follows:

Control	Name	Text	Other Properties
Panel
Label		Number &1:
TextBox	txtNumber1		Text: 0.00 TextAlign: Right
Label		Number &2:
TextBox	txtNumber2		Text: 0.00 TextAlign: Right
Label		Result:
TextBox	txtResult	0.00	Text: 0.00 TextAlign: Right
Panel
RadioButton	rdoAddition	&Addition	CheckAlign: MiddleRight
RadioButton	rdoSubtraction	&Subtraction	CheckAlign: MiddleRight
RadioButton	rdoMultiplication	&Multiplication	CheckAlign: MiddleRight
RadioButton	rdoDivision	&Division	CheckAlign: MiddleRight
Button	btnClose	Close

Double-click the Close button and double-click each radio button

Implement their Click events as follows:

private void btnClose_Click (Object sender, System.EventArgs e)
	{
		Close();
	}

	private void rdoAddition_CheckedChanged (Object sender, System.EventArgs e)
	{
		double Number1, Number2, Result;

		if( txtNumber1.get_Text() == "" )
			Number1 = 0;
		else
			Number1 = System.Convert.ToDouble(txtNumber1.get_Text());

		if( txtNumber2.get_Text() == "" )
			Number2 = 0;
		else
			Number2 = System.Convert.ToDouble(txtNumber2.get_Text());

		Result = Number1 + Number2;
		txtResult.set_Text(String.Format("{0}", (System.Double)Result));
	}

	private void rdoSubtraction_CheckedChanged (Object sender, System.EventArgs e)
	{
		double Number1, Number2, Result;

		if( txtNumber1.get_Text() == "" )
			Number1 = 0;
		else
			Number1 = System.Convert.ToDouble(txtNumber1.get_Text());

		if( txtNumber2.get_Text() == "" )
			Number2 = 0;
		else
			Number2 = System.Convert.ToDouble(txtNumber2.get_Text());

		Result = Number1 - Number2;
		txtResult.set_Text(String.Format("{0}", (System.Double)Result));
	}

	private void rdoMultiplication_CheckedChanged (Object sender, System.EventArgs e)
	{
		double Number1, Number2, Result;

		if( txtNumber1.get_Text() == "" )
			Number1 = 0;
		else
			Number1 = System.Convert.ToDouble(txtNumber1.get_Text());

		if( txtNumber2.get_Text() == "" )
			Number2 = 0;
		else
			Number2 = System.Convert.ToDouble(txtNumber2.get_Text());

		Result = Number1 * Number2;
		txtResult.set_Text(String.Format("{0}", (System.Double)Result));
	}

	private void rdoDivision_CheckedChanged (Object sender, System.EventArgs e)
	{
		double Number1, Number2, Result;

		if( txtNumber1.get_Text() == "" )
			Number1 = 0;
		else
			Number1 = System.Convert.ToDouble(txtNumber1.get_Text());

		if( txtNumber2.get_Text() == "" )
			Number2 = 0;
		else
			Number2 = System.Convert.ToDouble(txtNumber2.get_Text());

		Result = Number1 / Number2;
		txtResult.set_Text(String.Format("{0}", (System.Double)Result));
	}

Test the application.


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