C Program to read last n characters from the file !

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

Problem Statement : Write a C Program to read last n characters from the file . Open a file in read mode. Accept value of n .

#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("test.txt","r");
if(fp==NULL)
    {
    puts("cannot open this file");
    exit(1);
    }
/* Move the file pointer to end of file */
fseek(fp,0,SEEK_END); 
/* Read the length of the file */
len = ftell(fp);
/* Move the file pointer at the beginning of last n characters */
fseek(fp,(len-n),SEEK_SET);
  do
    {
    a=fgetc(fp);
    putchar(a);
    }while(a!=EOF);
fclose(fp);
getch();
}

Output :

Enter the value of n : 4
.com 

Actual Content from File :

Pritesh Abhiman Taral
Author of c4learn.com