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When SquareIt() gets called, memory is allocated for an int (number) and for a pointer to an int (squarePtr). Once the local memory is allocated, the value 5 is copied into the local parameter number, and the address of square is copied into squarePtr (recall that the & operator produces the address of a variable). Inside the function SquareIt(), any reference to

*squarePtr = number * number;

Lab Exercise 401: The Windows Interface Lab Exercise 402: The Windows Desktop Lab Exercise 403: Windows Explorer Lab Exercise 404: The Windows Control Panel

assigns the value 25 (since number has a value of 5) to the variable pointed to by squarePtr. This has the effect of assigning the value 25 to square. When SquareIt() returns control to main(), the value of square has been changed, as evidenced by the screen shot in Figure 7-9. If you d like to give this code a try, you ll find it in the Learn C Projects folder, inside the 07.02 squareIt subfolder.

Figure 7-9. The results of running squareIt. This program shows how to pass a parameter by address.

This chapter introduces the art of processor design, the instruction set architecture (ISA) as the specification of the processor, and the microarchitecture as the implementation of the processor The dynamic/static interface that separates compile-time

57 62 69 78

The combination of pointers and parameters gives us one way to share variables between different functions. This section demonstrates two more techniques for doing the same. Global variables are variables that are accessible from inside every function in your program. By declaring a global variable, two separate functions can access the same variable without passing parameters. We ll show you how to declare a global variable, and then talk about when and when not to use global variables in your programs. Another topic we ll discuss later in the chapter is a property common to all functions. All functions written in C have the ability to return a value to the function that calls them. You set this return value inside the function itself. You can use a function s return value in place of a parameter, use it to pass additional information to the calling function, or not use it at all. I ll show you how to add a return value to your functions.

Earlier in this chapter, you learned how to use parameters to share variables between two functions. Passing parameters between functions is great. You can call a function, pass it some data to work on, and when the function s done, it can pass you back the results. Global variables provide an alternative to parameters. Global variables are just like regular variables, with one exception. Global variables are immune to C s scope rules. They can be referenced inside each of your program s functions. One function might initialize the global variable; another might change its value; and another function might print the value of the global variable in the console window. As you design your programs, you ll have to make some basic decisions about data sharing between functions. If you ll be sharing a variable among a number of functions, you might want to consider making the variable a global. Globals are especially useful when you want to share a variable between two functions that are several calls apart. Several calls apart At times, you ll find yourself passing a parameter to a function, not because that function needs the parameter, but because the function calls another function that needs the parameter. Look at this code:

Lab Exercise 405: The Windows Microsoft Management Console (MMC) Toolbox Lab Exercise 406: The Windows Registry Lab Analysis Test Key Term Quiz

#include <stdio.h> void PassAlong( int myVar ); void PrintMyVar( int myVar ); int main( void ) { int myVar;

myVar = 10; PassAlong( myVar ); return 0; } void PassAlong( int myVar ) { PrintMyVar( myVar ); } void PrintMyVar( int myVar ) { printf( "myVar = %d", myVar ); }

This chapter, compiled by Prof Mark Smotherman of Clemson University, provides a historical chronicle on the development of superscalar machines and a survey of existing superscalar microprocessors The chapter was first completed in 1998 and has been continuously revised and updated since then It contains fascinating information that can't be found elsewhere