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# Visual Basic (Triangle Application)

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(Triangle Creator Application) Create an application that allows the user to enter the lengths for the three sides of a triangle as Integers. The application should then determine whether the triangle is a right triangle (two sides of the triangle form a 90-degree angle), an equilateral triangle (all sides of equal length) or neither. The application's GUI is completed for you (Fig. 19.45). You must create a class to represent a triangle object and define the event handler for the Create Button.

a) Copying the template to your working directory. Copy the directory C: Exampl esTutori al 19ExercisesTri angl e to your C: Si mpl yVB2008 directory.
b) Opening the application's template file. Double click Tri angl e. sl n in the Tri angl e directory to open the application.
c) Creating the Triangle class. Add a class to the project, and name it Tri angl e. This is where you define the properties of the Tri angl e class.
d) Defining the necessary constructor and properties. Define a constructor that takes the lengths of the three sides of the triangle as arguments. Create three properties that enable clients to access and modify the lengths of the three sides. If the user enters a negative value, that side should be assigned the value zero and the display updated.
e) Adding additional features. Create two more properties in the Tri angl e class— one determines whether the sides form a right triangle, the other an equilateral triangle. Use the Pythagorean theorem (a 2 + b 2 = c 2) to test for a right triangle. These properties are considered read-only, because you would naturally define only the Get accessor. There is no simple Set accessor that can make a triangle a right triangle or an equilateral triangle without first modifying the lengths of the triangle's sides. To create a read-only property (where the Set accessor is omitted), precede keyword Property with the keyword ReadOnl y.
f) Adding code to event handler. Now that you have created your Tri angl e class, you can use it to create objects in your application. Double click the Create Button in Design view to generate the event handler. Create new variables to store the three lengths from the TextBoxes; then use those values to create a new Tri angl e object.
g) Displaying the result. Use an If... ElseIf statement to determine whether the triangle is a right triangle, an equilateral triangle or neither. Display the result in a Label .
h) Running the application. Select Debug > Start Debugging to run your application. Add various inputs until you have created an equilateral triangle, a right triangle and a triangle that is neither right nor equilateral. Verify that the proper output is displayed for each.
i) Closing the application. Close your running application by clicking its close box.
j) Closing the IDE. Close the Visual Basic IDE by clicking its close box.

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#### Solution Summary

The expert examines visual basic for triangle applications.

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## Pythagorean theorem formula

Calculate the hypotenuse of a right-angled triangle. The Pythagorean theorem. The application should also allow the user to perform a cylinder volume calculation.

Pythagorean theorem formula:
a2 + b2 = c2

Cylinder volume formula:
Cylinder volume = r2 h

Allow the user to enter the value of "a" and the value of "b" to calculate c2.
Use NumericUpdown controls for both a and b to allow the user to enter the values.
Use NumericUpdown controls to enter the value of "r" and "h" in the cylinder volume calculation.
Display the result in a text box and set it as read-only.
Create a group box with two radio buttons that would allow the user to select which calculation to perform (Pythagorean theorem or cylinder volume).
Make the Calculate button the Accept button.
Create a Clear button that will clear the result text box and reset both NumericUpdown controls.
Create an Exit button.
Use labels to identify the input and output controls and change the label text value according to the radio button selected.

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