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Using the Bookend No organizational structure allows you to make bad news palatable It won t convert bad news into good news, nor will it make the recipient happy, but it is the best way to convey negative information The Bookend No organizational structure starts with a positive statement, leads into the negative news, and nishes with another positive statement Note that you can t fake it, ie, if you have nothing positive to say, you can t use this organizational structure It works well with letters and informal E-mails

// 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:

Simple manipulation yields 200 < k4 15 This condition is satisfied when k = 2 Thus our job is easy We take the partition P = {0, 1/2, 1} The sum arising from Simpson's Rule is then S= = = 1/2 { f ( 0) + 4 f ( 1/2) + f ( 1) } 3 1 02 2 2 {e + 4 e ( 1/2) + e 1 } 6 1 {1 + 31152 + 03679} 6 1 44831 6

// 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; } }

// //

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

07472 Comparing with the ``exact value'' 0746824 for the integral that we noted in Example 829, we find that we have achieved two decimal places of accuracy It is interesting to note that if we had chosen a partition with k = 6, as we did in Example 829, then Simpson's Rule would have guaranteed an accuracy of 12 15 M ( b a) 5 = 000005144 , 180 k4 180 64 or nearly four decimal places of accuracy

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

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