<< Chapter < Page
  Xna game studio     Page 11 / 12
Chapter >> Page >

Validating code

You can write whatever validating code is appropriate before assigning the incoming value to a private instance variable or perhaps storing it in a privatedata structure of some other type.

In this case, the value is accepted and stored in the private instance variable named heightData if it is less than 84 (the height in inches of a person that is seven feet tall). If the incoming value is greaterthan 83, it is not accepted and instead is flagged as invalid by storing 0 in the private instance variable.

A read-only property

You can omit the code on the set side if you need a read-only property.

Little more to say about this

There isn't much more that I can say to explain this syntax other than to tell you to memorize it. The code in Listing 5 causes the fourth line of text shown in Figure 1 to be displayed on the black screen.

Call manipulator method and display results

In addition to making it possible to set and get property values, objects often provide other public interface methods of varying complexity that make itpossible to manipulate the data stored in the object in a variety of ways. In those cases, the using programmer needs access to good documentation thatexplains the behavior of such manipulator methods.

Returning to the Main method, Listing 7 calls a manipulator method named doubleHeight (belonging to the object of type TargetClass ) that is designed to double the value of the height property. Then Listing 7 accesses and displays the new value of the height property.

Listing 7 . Call manipulator method and display results.

obj.doubleHeight(); Console.WriteLine("double height: " + obj.height);

A manipulator method named doubleHeight

Listing 8 shows the manipulator method named doubleHeight that is defined in the class named TargetClass .

Listing 8 . A simple manipulator method named doubleHeight.

public void doubleHeight(){ heightData *= 2;}//end doubleHeight //--------------------------------------------------//}//end TargetClass

The method multiplies the current value in the private instance variable that is used to store the property named height by a factor of two, stores the modified value back into the same variable, and returns void .

The code in Listing 7 causes the fifth line of text shown in Figure 1 to be displayed.

Listing 8 also signals the end of the class named TargetClass .

Set and get the property with an invalid value

Returning once more to the Main method, Listing 9 attempts to set an invalid value into the property named height .

Listing 9 . Set and get the property named height with an invalid value.

obj.height = 100; Console.WriteLine("height: " + obj.height);

Then it retrieves and displays the value currently stored in that property.

As you saw in Listing 6 , when an attempt is made to set a value greater than 83 in the property, a value of 0 is set in the property to flag it as invalid.

The code in Listing 9 causes the last line of text in Figure 1 to be displayed on the black screen.

Pause until the user presses any key

The last statement in the Main method, shown in Listing 10 , causes the program to block and wait until the user presses a key. This causesthe black screen to remain on the desktop until the user is finished viewing it.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Xna game studio' conversation and receive update notifications?