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// Public vs private access using System; class MyClass { private int alpha; // private access explicitly specified int beta; // private access by default public int gamma; // public access // Methods to access alpha and beta It is OK for a member // of a class to access a private member of the same class public void SetAlpha(int a) { alpha = a; } public int GetAlpha() { return alpha; } public void SetBeta(int a) { beta = a; } public int GetBeta() { return beta; } } class AccessDemo { static void Main() { MyClass ob = new MyClass();

8:

public void Save(string fileName) { . . . // Store the data for each photograph foreach (Photograph photo in this) { sw.WriteLine(photo.FileName); sw.WriteLine(photo.Caption); } }

// Access to alpha and beta is allowed only through methods obSetAlpha(-99); obSetBeta(19); ConsoleWriteLine("obalpha is " + obGetAlpha()); ConsoleWriteLine("obbeta is " + obGetBeta()); // You cannot access alpha or beta like this: obalpha = 10; // Wrong! alpha is private! obbeta = 9; // Wrong! beta is private! // It is OK to directly access gamma because it is public obgamma = 99; } }

Note that the rest of our Save method works as before. In particular, the current version number is written as the first line of the file. Since we updated the constant for this number, the value written to our new album files is updated as well. Next we need to modify our Open method to read the new file format. We will also preserve backward compatibility with our older version. This can be done by handling MODAL DIALOG BOXES 239

// //

Values computed for 1987 Ford Ranger pickup; weight = 3800 lbs; coefficient of drag, Cd = 045; frontal area, A = 24 square feet; relative wind factor, Crw = 16; relative wind, w = 75 mph; tires = P185/75R14; revolutions/mile = 808; torque multiplier = 84034/(revolutions/mile) = 104

As you can see, inside the MyClass class, alpha is specified as private, beta is private by default, and gamma is specified as public Because alpha and beta are private, they cannot be accessed by code outside of their class Therefore, inside the AccessDemo class, neither can be used directly Each must be accessed through public methods, such as SetAlpha( ) and GetAlpha( ) For example, if you were to remove the comment symbol from the beginning of the following line

our previous version number 66 in addition to our new one. We continue the previous table with the following steps.

// obalpha = 10; // Wrong! alpha is private!

UPDATE THE OPEN METHOD TO READ CAPTIONS Action 3 Modify the switch block in the Open method to recognize both the old and current version. Result

you would not be able to compile this program because of the access violation Although access to alpha by code outside of MyClass is not allowed, methods defined within MyClass can freely access it, as the SetAlpha( ) and GetAlpha( ) methods show The same is true for beta The key point is this: A private member can be used freely by other members of its class, but it cannot be accessed by code outside its class

The proper use of public and private access is a key component of successful object-oriented programming Although there are no hard and fast rules, here are some general principles that serve as guidelines: Members of a class that are used only within the class itself should be private Instance data that must be within a specific range should be private, with access provided through public methods that can perform range checks If changing a member can cause an effect that extends beyond the member itself (that is, affects other aspects of the object), that member should be private, and access to it should be controlled Members that can cause harm to an object when improperly used should be private Access to these members should be through public methods that prevent improper usage Methods that get and set the values of private data must be public Public instance variables are permissible when there is no reason for them to be private