#include <stdio.h>
#include <stdlib.h>
/* Example 3 - jumping & getting element count */
int main(void)
{
int ValRead;
int Item;
int Locn;
FILE *fptr;
/* Open the file from example 1 */
fptr = fopen ("data.dat","rb");
if ( fptr == NULL )
printf ("\nError opening input file - aborting ");
exit (0);
}
/* Ask the user which value to jump to */
printf ("\nWhich value do you wish to view ? ");
scanf ("%d",&Item);
/* Jump to this item */
/* notice we move in steps of item size */
Locn = Item * sizeof(int);
fseek (fptr, Locn, SEEK_SET);
/* And read a single integer in */
if (fread (&ValRead, sizeof(int), 1, fptr ) == 1)
/* Display the read value */
printf ("Item %d is %d\n",Item,ValRead);
else
printf("Failed to read at location %d\n", Item);
/* And close */
fclose (fptr);
/* All Done */
return 0;
