/* Code for exercise 15.3. |  | "C++ Solutions--Companion to The C++ Programming Language, Third Edition" | by David Vandevoorde; Addison-Wesley 1998; ISBN 0-201-30965-3. | | Permission to use, copy, modify, distribute and sell this software | and its documentation for any purpose is hereby granted without fee. | The author makes no representations about the suitability of this | software for any purpose.  It is provided "as is" without express or | implied warranty. `----------------------------------------------------------------------*/#include <assert.h>#include "HumanTextPlayer.H"namespace { // anonymous namespace   void convert(char &ch, int upper) {      if (ch>='a' and ch<'a'+upper)         ch = ch-'a'+1;      else if (ch>='A' and ch<'A'+upper)         ch = ch-'A'+1;      else if (ch>='1' and ch<'1'+upper)         ch = ch-'1'+1;   }   bool in_board(int row, int col) {      return (row>0) and (row<=Board::kNRows)         and (col>0) and (col<=Board::kNCols);   }   void print_color(ostream &output, Color color) {      if (color==kBlack)         output << "Black";      else         output << "White";   }} // end anonymous namespacevoid HumanTextPlayer::get_move(Board const &board,                               int &r, int &c) {   char row, col;   do {      print_color(output_, color_);      output_ << ", enter your move (e.g., a7) : ";      input_ >> row >> col;      convert(row, Board::kNRows);      convert(col, Board::kNCols);      if (in_board(row, col)      and board.valid_move(color_, row, col))         break;      board.get_possible_move(color_, r, c);      output_ << "Invalid move. Please try again.\n"               << char('a'+r-1) << char('1'+c-1)              << " is a valid example,"                 " but other moves may be better.\n";   } while (1);   r = row; c = col;}void HumanTextPlayer::skip_move(Board const&) {   print_color(output_, color_);   output_ << ": no valid move possible.\n";}void HumanTextPlayer::win() {   print_color(output_, color_);   output_ << " wins!\n";}void HumanTextPlayer::tie() {   if (color_==kBlack)      output_ << "Game tied.\n";   else      output_ << "No winner!\n";}