password c

#include <stdio.h> 
#include <conio.h> 
#include <ctype.h> 

int main()
{
  int ch;
  char pword[BUFSIZ];
  int i = 0;
  
  puts ("Enter your password");
  fflush(stdout);
  
  while ((ch = getch()) != EOF 
          && ch != '\n' 
          && ch != '\r' 
          && i < sizeof(pword) - 1)
  {
    if (ch == '\b' && i > 0) 
    {
      printf("\b \b");
      fflush(stdout);
      i--;
      pword[i] = '\0';
    }
    else if (isalnum(ch))
    {
      putchar('*');
      pword[i++] = (char)ch;
    }
  }

  pword[i] = '\0';
  
  printf ("\nYou entered >%s<", pword);
  
  return 0;
}