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The integer variable x is declared twice, once in func1( ) and once in func2( ) The x in func1( ) has no bearing on or relationship to the x in func2( ) As explained, this is because each x is known only to the code within the block in which it is declared The C language contains the keyword auto, which you can use to declare local variables However, since all nonglobal variables are, by default, assumed to be auto, this keyword is virtually never used Hence, the examples in this book will not use it For reasons of convenience and tradition, most programmers declare all the variables used by a function immediately after the function's opening curly brace and before any other statements However, you may declare local variables within any code block The block defined by a function is simply a special case For example:

exists in a media server,6-19 an appropriate logical device associated with the server must be added to the call (See 11 for more on the actual configuration of CTI systems that utilize media servers) If gaining access to the media service instance requires call control activity, the call may be associated with the logical device providing the media services either by joining the device to the call (conferencing), or by diverting the call to the device (transferring) according to the computing domain's request and depending on the switching domain implementation These operations, if required, are performed by the switching domain and may be implemented using the transfer call, single step transfer call, conference call, or single step conference call service If any call control activities take place as a result of the attach media service service request or the detach media service service request, appropriate events are provided to indicate what is taking place

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Once a computer is configured to use DHCP, it s called a DHCP client When a DHCP client boots up it automatically sends out a special DHCP discovery packet using the broadcast address This DHCP discovery message asks: Are there any DHCP servers out there (See Figure 7-39)

Page 23 void f(void) { int t; scanf("%d%*c", &t); if(t==l) { char s[80]; /* this is created only upon entry into this block */ printf(''Enter name:"); gets(s); /* do something */ } /* s not known here */ }

For DHCP to work, there must be one system on the LAN running special DHCP server software This server is designed to respond to DHCP discovery requests with a DHCP offer The DHCP server is configured to pass out IP addresses from a range (called a DHCP scope), a subnet mask, and a default gateway (Figure 7-40) It also passes out other information that we ll cover in later chapters

Here, the local variable s is created upon entry into the if code block and destroyed upon exit Furthermore, s is known only within the if block and cannot be referenced elsewhere even in other parts of the function that contains it Declaring variables within the block of code that uses them helps prevent unwanted side effects Since the variable does not exist outside the block in which it is declared, it cannot be accidentally altered by other code When a variable declared within an inner block has the same name as a variable declared by an enclosing block, the variable in the inner block hides the variable in the outer block Consider the following:

The mechanisms for utilizing a given media service using a media stream identifier are determined by the definition of the media service itself and generally are industry or de facto standards The flow of messages between the computing domain and the switching domain implementations relative to a particular media service are referred to as media service sessions Figure 6-34 illustrates the basic model for media stream access When the CTI client implementation requests the use of a particular media service, it does so using the CTI protocol flowing through the CTI stream The logical CTI server binds the media service requested to the call specified and returns the appropriate media stream identifier (through the CTI stream) The media stream identifier then can be used by software running on the logical CTI client to access the media service stream appropriately This includes determining how the

#include <stdioh> int main(void) { int x; x = 10; if(x == 10) { int x; /* this x hides the outer x */ x = 99; printf("Inner x: %d\n", x); }

I m a DHCP server, and I can help Your IP is 192168542, your subnet is /24 and your gateway is 19216851

6-19

Page 24 printf("Outer x: %d\n", x); return 0; }

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