C program to read last n chatacters of the file using appropriate file function

 C program to read last n chatacters of the file using appropriate file function

Ans. :
Program to read last n characters from the file */
#include<stdio.h>

void main()
  {
FILE *fp;
char a;
int n;
long len;
clrscr();
printf("Enter the value of n : ");
scanf("%d",&n);
fp=fopen("d:\\dtp\\test.txt","r");
if(fp==NULL)
{
puts("cannot open this file");
exit(1);
}
fseek(fp,0,SEEK_END); /* Move the file pointer to end of file */
len = ftell(fp);      /* Read the length of the file */
fseek(fp,(len-n),SEEK_SET);  /* Move the file pointer at the beginning of last n characters */
 do
 {
 a=fgetc(fp);
 putchar(a);
 }
 while(a!=EOF);
 fclose(fp);
 getch();
}