// File: navFileOfBinInt.c
// Read and print selected elements from a file of integers stored in binary format
#include <stdio.h>
#include <string.h>

main(int argc,char **argv)
{if (argc != 2) {
   printf("Format: %s <binary file of int>",argv[0]);
   return(-2);
 }
 int n,count=0,intNum;
 FILE *fp;
 fp=fopen(argv[1],"rb+");
 while (!feof(fp)) {
   fread(&n,sizeof(int),1,fp);
   printf("fread %d\n",n);
   count++;
 }
 printf("Enter a number between 0 and %d, -1 to exit >",count);
 scanf("%d",&intNum);
 while (intNum>=0){
   fseek(fp,intNum*sizeof(int),0);
   fread(&n,sizeof(int),1,fp);
   printf("fread Integer #%d:%d\n",intNum,n);
   printf("Enter a number between 0 and %d, -1 to exit >",count);
   scanf("%d",&intNum);
 }
 close(fp);
}