Chapter 4, Problem 5PP

Program Plan Intro

Distance converter

Program plan:

Design the form:

• • Place a one text boxes control on the form, and change its name and properties to get the distance from the user.
• • Place a three label boxes control on the form, and change its name and properties.
• • Place a two group boxes control on the form, and change its name and properties.
• • Place a two list boxes control on the form, and change its name and properties to list of items.
• • Place a command button on the form, and change its name and properties to convert distance and then display it.
• • Place a command button on the form, and change its name and properties to end the application.

In code window, write the code:

Program.cs:

• • Include the required libraries.
• • Define the namespace “DistanceConverter”.
  • ○ Define a class “Program”.
    • ■ Define a constructor for the class.
    • ■ Define required functions to run “Form1”.

Form1.cs:

• • Include the required libraries.
• • Define namespace “DistanceConverter”.
  • ○ Define a class “Form1”.
  • ○ In btnConvert() method,
    • ■ Declare the required variables.
    • ■ Check whether selected index for From list and To list is not equal to “-1”. If yes, display the result.
    • ■ Otherwise, check whether From list is equal to “Yards” and To list is equal to “Feet”. If yes, calculate the distance in feet and display the result.
    • ■ Otherwise, check whether From list is equal to “Feet” and To list is equal to “Yards”. If yes, calculate the distance in yards and display the result.
    • ■ Otherwise, check whether From list is equal to “Yards” and To list is equal to “Inches”. If yes, calculate the distance in inches and display the result.
    • ■ Otherwise, check whether From list is equal to “Inches” and To list is equal to “Yards”. If yes, calculate the distance in yards and display the result.
    • ■ Otherwise, check whether From list is equal to “Feet” and To list is equal to “Inches”. If yes, calculate the distance in inches and display the result.
    • ■ Otherwise, check whether From list is equal to “Inches” and To list is equal to “Feet”. If yes, calculate the distance in feet and display the result.
  • ○ In btnClose() method,
    • ■ Close the application.

Form Design:

View the Form Design in IDE.

Set the Form Control properties in Properties window as follows:

Object	Property	Setting
Form1	Text	Distance Converter
label1	Text	Enter a distance to convert:
label2	Text	Converted Distance:
lblResult	Text	(Empty)
textBox1	Text	(Empty)
groupBox1	Text	From
groupBox1	Text	To
From	Items
	(Collection)	Inches
		Feet
		Yards
To	Items
	(Collection)	Inches
		Feet
		Yards
btnConvert	Text	Convert
btnExit	Text	Exit

• • Add three label box controls to the form from Toolbox.
• • Add one text box to the form from Toolbox.
• • Add two group boxes to the form from Toolbox.
• • Add two list boxes to the form from Toolbox.
• • Add two command boxes to the form from Toolbox.