Category : Files from Magazines
Archive : PTV1N5.ZIP
Filename : L5.C
Output of file : L5.C contained in archive : PTV1N5.ZIP
variable-sized blocks for all entries with a specified ID number
and return the average of the values of all such entries. Each of
the variable-sized blocks may contain any number of data entries,
stored in the form of two separate arrays, one for ID numbers and
one for values.
*/
#include
#ifdef __TURBOC__
#include
#else
#include
#endif
void main(void);
void exit(int);
extern unsigned int FindIDAverage2(unsigned int,struct BlockHeader *);
/* Structure that starts each variable-sized block */
struct BlockHeader {
struct BlockHeader *NextBlock; /* pointer to next block, or NULL
if this is the last block in the
linked list */
unsigned int BlockCount; /* the number of DataElement entries
in this variable-sized block */
};
void main(void) {
int i,j;
unsigned int IDToFind;
struct BlockHeader *BaseArrayBlockPointer,*WorkingBlockPointer;
int *WorkingDataPointer;
struct BlockHeader **LastBlockPointer;
printf("ID # for which to find average: ");
scanf("%d",&IDToFind);
/* Build an array across 5 blocks, for testing */
/* Anchor the linked list to BaseArrayBlockPointer */
LastBlockPointer = &BaseArrayBlockPointer;
/* Create 5 blocks of varying sizes */
for (i = 1; i < 6; i++) {
/* Try to get memory for the next block */
if ((WorkingBlockPointer =
(struct BlockHeader *) malloc(sizeof(struct BlockHeader) +
sizeof(int) * 2 * i * 10)) == NULL) {
exit(1);
}
/* Set the # of data elements in this block */
WorkingBlockPointer->BlockCount = i * 10;
/* Link the new block into the chain */
*LastBlockPointer = WorkingBlockPointer;
/* Point to the first data field */
WorkingDataPointer = (int *) ((char *)WorkingBlockPointer +
sizeof(struct BlockHeader));
/* Fill in the data fields with ID numbers and values */
for (j = 0; j < (i * 10); j++, WorkingDataPointer++) {
*WorkingDataPointer = j;
*(WorkingDataPointer + i * 10) = i * 1000 + j;
}
/* Remember where to set the link from this block to the next */
LastBlockPointer = &WorkingBlockPointer->NextBlock;
}
/* Set the last block's "next block" pointer to NULL to indicate
that there are no more blocks */
WorkingBlockPointer->NextBlock = NULL;
printf("Average of all elements with ID %d: %u\n",
IDToFind, FindIDAverage2(IDToFind, BaseArrayBlockPointer));
exit(0);
}
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/