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Let s examine this program carefully The program defines one private field, called prop, and a property called MyProp that manages access to prop As explained, a property by itself does not define a storage location Instead, most properties simply manage access to a field Furthermore, because prop is private, it can be accessed only through MyProp The property MyProp is specified as public so it can be accessed by code outside of its class This makes sense because it provides access to prop, which is private The get accessor simply returns the value of prop The set accessor sets the value of prop if and only if that value is positive Thus, the MyProp property controls what values prop can have This is the essence of why properties are important The type of property defined by MyProp is called a read-write property because it allows its underlying field to be read and written It is possible, however, to create read-only and write-only properties To create a read-only property, define only a get accessor To define a write-only property, define only a set accessor You can use a property to further improve the fail-soft array class As you know, all arrays have a Length property associated with them Up to now, the FailSoftArray class simply used a public integer field called Length for this purpose This is not good practice, though, because it allows Length to be set to some value other than the length of the failsoft array (For example, a malicious programmer could intentionally corrupt its value) We can remedy this situation by transforming Length into a read-only property, as shown in the following version of FailSoftArray:

// Add Length property to FailSoftArray using System; class FailSoftArray { int[] a; // reference to underlying array int len; // length of array -- underlies Length property public bool ErrFlag; // indicates outcome of last operation // Construct array given its size public FailSoftArray(int size) { a = new int[size]; len = size; } // Read-only Length property public int Length { get { return len; } }

By dividing the task of writing into three distinct steps, you ll nd the process of writing easier and discover shortcuts that will save you time The three steps are: Step One: Get Your Thoughts in Order Step Two: Create a Draft on Paper (or on Your Computer) Step Three: Revise for Clarity Within each chapter, there are several exercises Intended to ensure that you practice using the tools, the exercises are challenging and fun Additionally, the exercises will help you: prove to yourself that you ll be able to remember and use the three-step model know that there are always several ways to express a thought; this tip helps you avoid writer s block as you hunt for the one right way to write something save time and energy while still producing top-notch writing; no more will you be dependent on the aha of creative inspiration Each chapter uses speci c techniques to elicit the information needed to write well This approach, therefore, becomes a checklist for you as you go through the writing process Over time, you ll discover that the more frequently you consult the checklist, the more quickly the system will become second nature The checklist includes:

10:

// This is the indexer for FailSoftArray public int this[int index] { // This is the get accessor get { if(ok(index)) { ErrFlag = false; return a[index]; } else { ErrFlag = true; return 0; } } // This is the set accessor set { if(ok(index)) { a[index] = value; ErrFlag = false; } else ErrFlag = true; } } // Return true if index is within bounds private bool ok(int index) { if(index >= 0 & index < Length) return true; return false; } } // Demonstrate the improved fail-soft array class ImprovedFSDemo { static void Main() { FailSoftArray fs = new FailSoftArray(5); int x; // Can read Length for(int i=0; i < fsLength; i++) fs[i] = i*10; for(int i=0; i < fsLength; i++) { x = fs[i]; if(x != -1) ConsoleWrite(x + " "); } ConsoleWriteLine(); // fsLength = 10; // Error, illegal! } }