//Warning,written by hand.Mistakes are possible
 
void pass(char *s,int len,char mask='*')
{
     int loc = 0;
     char p;
     int x = getx();
     int y = gety();
 
    do
      {
          p = getch();
          if(p == '\r')           // \r = enter
          {
                s[loc] = 0;
                break;
          }
          else if(p == '\b')   // \b means backspace
          {
               if(loc>0)
               {
                       s[loc]=0;
                       loc--
                       gotoxy(x-1,y);
                       cout<<" ";
                       gotoxy(--x,y);
               }
          }
          else
          {
                s[loc++] = p;
                 x++;
                cout<<m;
          }
 
     }
    while(true);
}