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ConsoleWriteLine(); // Now, display failures ConsoleWriteLine("\nFail with error reports"); for(int i=0; i < 6; i++) { fs[i,i] = i*10; if(fsErrFlag) ConsoleWriteLine("fs[" + i + ", " + i + "] out-of-bounds"); } for(int i=0; i < 6; i++) { x = fs[i,i]; if(!fsErrFlag) ConsoleWrite(x + " "); else ConsoleWriteLine("fs[" + i + ", " + i + "] out-of-bounds"); } } }

The output from this program is shown here:

Fail quietly 0 10 20 0 0 0 Fail with error reports fs[3, 3] out-of-bounds fs[4, 4] out-of-bounds fs[5, 5] out-of-bounds 0 10 20 fs[3, 3] out-of-bounds fs[4, 4] out-of-bounds fs[5, 5] out-of-bounds

148 148 148 154 154 154 155 156 158 160 160

Another type of class member is the property As a general rule, a property combines a field with the methods that access it As some examples earlier in this book have shown, you will often want to create a field that is available to users of an object, but you want to maintain control over the operations allowed on that field For instance, you might want to limit the range of values that can be assigned to that field While it is possible to accomplish this goal through the use of a private variable along with methods to access its value, a property offers a better, more streamlined approach Properties are similar to indexers A property consists of a name along with get and set accessors The accessors are used to get and set the value of a variable The key benefit of a property is that its name can be used in expressions and assignments like a normal variable, but in actuality the get and set accessors are automatically invoked This is similar to the way that an indexer s get and set accessors are automatically used The general form of a property is shown here: type name { get { // get accessor code }

Your Salutation and Lead Set the Tone 62 Hook Your Readers Interest with a Compelling Lead 66 Exercise 9: Add Urgency Through Time-Sensitive Vocabulary 68 Add a Snappy Close 70 Exercise 10: Write a First Draft 74

10:

set { // set accessor code } } Here, type specifies the type of the property, such as int, and name is the name of the property Once the property has been defined, any use of name results in a call to its appropriate accessor The set accessor automatically receives a parameter called value that contains the value being assigned to the property It is important to understand that properties do not define storage locations Instead, a property typically manages access to a field It does not, itself, provide that field The field must be specified independently of the property (The exception is the auto-implemented property, which is described shortly) Here is a simple example that defines a property called MyProp, which is used to access the field prop In this case, the property allows only positive values to be assigned

532 Integrals with Infinite Integrands 533 An Application to Area 54 More on Improper Integrals 541 Introduction 542 The Integral on an Infinite Interval 543 Some Applications Quiz

// A simple property example using System; class SimpProp { int prop; // field being managed by MyProp public SimpProp() { prop = 0; } /* This is the property the private instance allows only positive public int MyProp { get { return prop; } set { if(value >= 0) prop } } } // Demonstrate a property class PropertyDemo { static void Main() { SimpProp ob = new SimpProp(); ConsoleWriteLine("Original value of obMyProp: " + obMyProp); obMyProp = 100; // assign value ConsoleWriteLine("Value of obMyProp: " + obMyProp); // Can't assign negative value to prop ConsoleWriteLine("Attempting to assign -10 to obMyProp"); obMyProp = -10; ConsoleWriteLine("Value of obMyProp: " + obMyProp); } } that supports access to variable prop It values */

The reason the preceding code will not work is that 10 is an integer value, and it won t automatically convert to a char If you attempt to compile this code, you will see an error message To make the assignment legal, you would need to employ a cast, which is described later in this chapter