Question

Give the C statements to open a file foobar for both read and write. Then, write three integers starting from the fourth element in the array defined as:

int arr[10];

at the byte location 27 from the beginning of the file.

Answer 1

#include <stdio.h>

int main() {
   int arr[10], i;
   FILE *fp=fopen("foobar", "r+");
   fseek(fp, 27, 0);
   for(i = 3; i < 6; ++i) {
       fprintf(fp, "%d", arr[i]);
   }
   return 0;
}