Study of random file access.

#include <stdio.h>

int main(void)
{
FILE *fp;
char ch;

fp = fopen("sample", "r+");

if(fp == NULL)
{
printf("\nUnable to open file for reading and writing");
return 1;
}

ch = fgetc(fp);
printf("\n%c", ch);

/* Seek fifth character from the end of file */
fseek(fp, -5, SEEK_END);
ch = fgetc(fp);
printf("\n\t%c", ch);

/* Seek tenth character from the beginning of file */
fseek(fp, 10, SEEK_SET);
ch = fgetc(fp);
printf("\n\t%c", ch);

/* Seek next character from the current position */
fseek(fp, 1, SEEK_CUR);
ch = fgetc(fp);
printf("\n\t%c", ch);

/* Reset file pointer to the beginning of the file */
fseek(fp, 0, SEEK_SET);
fputc('#', fp);

fclose(fp);

return 0;
}