[C-CODE] Reverse file content using lseek function

#include<protos.h>

#include<io.h>



void main()

{

 clrscr();



 int fd=open("C:\\text.txt",O_RDONLY);



 if(fd==-1)

 {

  printf("FIle does not exists....");

  return ;

 }



 char c;

 int i=0;

 lseek(fd,-1L-i,SEEK_END);



 do

 {

  read(fd,&c,1);

  printf("%c",c);

  i++;

 }

 while( lseek(fd,-1L-(i),SEEK_END)!=0);



 read(fd,&c,1);

 printf("%c",c);

 getch();

}

How to run it? 
$gcc file.c \
$./a.out