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Digital Photography QuickSteps Enhancing and Correcting Images PC QuickSteps Getting to Know Your PC

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Figure 19-1: Conventional radio requires users to queue on a channel Although SMR is primarily used for voice communications, systems are also being developed for data and facsimile services. Additionally, the development of a digital SMR marketplace allows the features shown in Table 19-1 . Table 19-1: Features possible with Digital SMR Features of a Digital SMR Network Two-way acknowledgment paging Inventory tracking Credit card authorization Automatic vehicle location Fleet management Remote database access Voicemail SMR growth is attributed to these developments and features. For example, at the end of 1998, approximately 8.8 million vehicles and portable units were served by SMR systems. Several radio-based systems have been introduced and used throughout the years. Many of these operated in a very specific frequency band and in specific geographic areas of the country in which they were approved. The purpose of a radio system is to provide the wireless technology to satisfy various needs as shown in Table 19-2 . Table 19-2: Radio services meeting the need Needs Addressed by Radio Based Systems Emergency operations (fire and police) Local transportation services

By default, C++ uses the call-by-value method for passing arguments. This means that, in general, code inside a function cannot alter the arguments used to call the function. In this book, all of the programs up to this point have used the call-by-value method. Consider this function:

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