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<Rectangle x:Name="buttonHoverGlow" Opacity="0" RadiusX="10" RadiusY="10"> <Rectangle.Fill> <LinearGradientBrush> <GradientStop Color="White" Offset="0"/> <GradientStop Color="White" Offset="0.1"/> <GradientStop Color="Transparent" Offset="0.6"/> </LinearGradientBrush> </Rectangle.Fill> </Rectangle>

Both the push( ) and pop( ) functions perform a relational test on the pointer p1 to detect limit errors In push( ), p1 is tested against the end of stack by adding STCKSIZE (the size of the stack) to tos In pop( ), p1 is checked against tos to be sure that a stack underflow has not occurred In pop( ), the parentheses are necessary in the return statement Without them, the statement would look like

return *p1 + 1;

Mid-Band Ethernet technologies target carriers that have access to outside copper plant loops, generally incumbent carriers and competitive carriers Cable providers, because they generally have a fiber/coax plant and no outside plant copper, are not the intended targeted provider for most Mid-Band Ethernet services

Yes, yet another rounded rectangle with a gradient. This rectangle uses another linear gradient, but we aren t setting the end points, so it will have the default angle. How do you determine the values for the stop offsets You play with the values until they look

Once compiled, all C/C++ programs organize the computer s memory into four regions: program code, global data, the stack, and the heap The heap is an area of free memory that is managed by the dynamic allocation functions malloc( ) and free( ) These functions were introduced in 5 in conjunction with arrays Here we will examine them further, beginning with a review of their of their basic operation Although C++ still supports C s dynamic allocation functions, it also defines its own approach, which is based upon dynamic allocation operators These are described in Part Three The malloc( ) function allocates memory and returns a pointer to the start of it free( ) returns previously allocated memory to the heap for possible reuse The prototypes for malloc( ) and free( ) are void *malloc(size_t num_bytes); void free(void *p);

Both functions use the <stdlibh> header Here, num_bytes is the number of bytes requested If there is not enough free memory to fill the request, malloc( ) returns a null The type size_t is defined in <stdlibh> and specifies an unsigned integer type that is capable of holding the largest amount of memory that may be allocated with a single call to malloc( ) It is important that free( ) be called only with a valid, previously allocated pointer; otherwise, the organization of the heap could be damaged, which might cause a program crash The code fragment shown here allocates 25 bytes of memory:

char *p; p = (char *) malloc(25);

Oooh, shiny!

5

After the assignment, p points to the first of 25 bytes of free memory The cast to char * is not needed for C but is required for C++ programs In C, if no type cast is used with malloc( ), the pointer type is converted automatically to the same type as the pointer variable on the left side of the assignment In C++, such implicit pointer conversions are disallowed Although not needed by C, the use of the type cast allows your C code to be compatible with C++ As another example, this fragment allocates space for 50 integers It uses sizeof to ensure portability

int *p; p = (int *) malloc(50*sizeof(int));

right. Even though you can t edit the properties in the property editor, the designer shows the changes as they re made in the XAML, so it s pretty easy to experiment. Notice that the Opacity of this rectangle is 0, meaning that it s invisible. To make it show up, we add another Setter to our IsMouseOver trigger. For the moment, we left the outer glow bitmap effect as well because it s pretty, and our calculator is simple enough that we don t mind spending a few cycles on it. For a real application, we d probably either implement the outer glow ourselves in some manner or live without it.

Since the heap is not infinite, whenever you allocate memory it is imperative to check the value returned by malloc( ) to make sure that it is not null before using the pointer Using a null pointer may crash the computer The proper way to allocate memory and test for a valid pointer is illustrated in this code fragment: