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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

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
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Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
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Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
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Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
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Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
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faisal Reply
cell is the smallest unit of life
Fauziya
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Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
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Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
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Innocent
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_Adnan
en français
Adama
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ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
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skin
Asiina
skin,Oral,Nasal,GIt
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all
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by fussion
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Micheal
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Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Xna game studio. OpenStax CNX. Feb 28, 2014 Download for free at https://legacy.cnx.org/content/col11634/1.6
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