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ter. It searches the string for the character and returns a pointer to the character inside the string, if it was found. If the character wasn t in the string, strchr() returns NULL. Pretty cool, eh Once we drop out of the loop, we ll print a separator line and return the single-letter command:

Step 4 Remove or disconnect any of the following cables from your system and describe its connector Follow this example: Data cable from the monitor to the PC Type of connector: End 1 (PC) Male or Female: End 1 (PC) F D-sub End 2 15 End 2 M D-sub

printf( "\n----------\n" ); return( command ); }

able 33 ranslating linear physical address to D R A M address* Organization (Figure 39)

Next up is ReadStruct(). Notice the unusual declaration of the function name:

Number of pins/holes/conductors:

/*****************************************> ReadStruct <*/ struct DVDInfo *ReadStruct( void ) {

This line says that ReadStruct() returns a pointer to a DVDInfo struct:

struct DVDInfo *ReadStruct( void )

Now it s your turn! Data cable from the printer to the PC (both ends) Type of connector: End 1 (PC) __________ Male or Female: End 1 (PC) __________ End 2 (printer) __________ End 2 (printer) __________ End 2 (printer) __________

Serial non-interleaved, 8-bit data b u s Parallel non-interleaved, 32-bit data b u s Serial interleaved, 8-bit data b u s Parallel interleaved 16-bit data b u s

The variable infoPtr will act as a pointer to the new block. We ll use the variable num to read in the rating, which we ll eventually store in infoPtr->rating.

struct DVDInfo int *infoPtr; num;

Number of pins/holes/conductors: End 1 (PC) __________ Data cable from the keyboard to the PC Type of connector: __________ Male or Female: ____________ Number of pins/holes/conductors: __________ Data cable from the mouse to the PC Type of connector: __________ Male or Female: __________ Number of pins/holes/conductors: __________

block returned to infoPtr:

infoPtr = malloc( sizeof( struct DVDInfo ) );

0x4321

Data cable from the network (cable modem/DSL modem) to the PC (both ends) Type of connector: __________ Male or Female: __________ Number of pins/holes/conductors: __________

If malloc() cannot allocate a block of the requested size, it will return a value of NULL. If this happens, we ll print an appropriate message and call the Standard Library function exit(). As its name implies, exit() causes the program to immediately exit. The parameter you pass to exit() will be passed back to the operating system (or to whatever program launched your program).

if ( NULL == infoPtr ) { printf( "Out of memory!!! exit( 0 ); } Goodbye!\n" );

If we re still here, malloc() must have succeeded. Next, we ll print a prompt for the DVD title and call fgets() to read a line from the input buffer. fgets() will place the line in the title field of the newly allocated struct. As a reminder, when you write your own programs, capture the values returned by printf() and fgets(), and handle any errors accordingly.

Data cable (telephone wire) from the internal modem to the telephone jack (both ends) Type of connector: __________ Male or Female: __________ Number of pins/holes/conductors: __________

printf( "Enter DVD Title: " ); fgets( infoPtr->title, kMaxTitleLength, stdin ); ReplaceReturnAtEndOfString( infoPtr->title );

0x4320

Earlier in the chapter (in the multiArray sample program), we discovered that fgets() leaves '\n' in place when it reads in a line of input. As we did in multiArray, we pass the char array to ReplaceReturnAtEndOfString() to replace the '\n' with a terminating zero ('\0'). We then repeat the process to prompt for and read in the DVD title.