TEXT FILE ANTIVIRUS C++ PROGRAM

This type of antivirus program are followed by many antivirus companies .However there program better then this.This program is only example of antivirus making using c++.
The main logic followed is the matching of characters(signatures) of infected file from virus database provided by company.
1st)   Write VIRUSACTIV on notepad and save it as vdt.dat in TCC. -(this will be your virus database)
2nd)  Write VIRUSACTIV on notepad and save it as inf.dat in TCC.-(filename to be search)
3rd)  Copy below code and run it.--by this u will learn how antivirus worked.


#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<fstream.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
void main()
{ clrscr();
ifstream f1,f2;
f1.open("vdt.dat");//VIRUS DATABASE
char p[100],q[100],w,d;
int i=0,ct=0;
long pos[100],pos2[100];
char comm[300], dirpath[100],filename[20];
while(!f1.eof())
{ f1.get(w);
 if(isalpha(w))
 {
 p[i]=w;
 pos[i]=f1.tellg();  i++;
 }
 } i=0;
 cout<<"**************************WELCOME TO TEXTFILE ANTIVIRUS-H.S*********************\n";
cout<<"\ntype the text(ext ex-txt/dat/bak etc) file name you want to scan = " ;
cin.getline(filename,20);
f2.open(filename);
 while(!f2.eof())
 {f2.get(d);
  if(isalpha(d))
  { q[i]=d;
     pos2[i]=f2.tellg();
     i++;
     }
  }
  for(int a=0;a<10;a++)
  { if((p[a]==q[a])&&(pos[a]==pos2[a]))
  ct++;


  }cout<<"\n*******************************SCAN COMPLETED**********************************\n";
  if (!(ct==10))
 cout<<"\n virus not found in this "<<filename<<" ..try another(existing) file\n";
 else
cout<<"VIRUS FOUND IN THIS" <<filename<< "ACTION-DELETION"<< remove(filename)<<"\n";
cout<<"*************************THANK YOU FOR USING**************************""\n";
cout<<"***************TEXT FILE ANTIVIRUS OF HIMANSHU SINGH************* ";
 getch();
 }

                This is the virus database file which was provided by antivirus company(original virus database file looks different from this vdt.dat). If words like"VIRUS ACTIV" found in inf.dat at the time of scanning .The inf.dat will be tagged as infected file.  

                                                
                                                                OUTPUT