p6_16m.cpp

生成一个TICTACTOE类

// P6_16M.cpp
// member function definitions for p6_16.cpp
#include <iostream.h>
#include <iomanip.h>
#include "p6_16.h"

TicTacToe::TicTacToe()
{
   for ( int j = 0; j < 3; ++j )    // initialize board
      for ( int k = 0; k < 3; ++k )
         board[ j ][ k ] = ' ';
}

bool TicTacToe::validMove( int r, int c )
{
   return r >= 0 && r < 3 && c >= 0 && c < 3 && board[ r ][ c ] == ' ';
}

// must specify that type Status is part of the TicTacToe namespace.
// See Chapter 21 for a discussion of namespaces.
TicTacToe::Status TicTacToe::gameStatus( void )
{   
   int a;

   // check for a win on diagonals
   if ( board[ 0 ][ 0 ] != ' ' && board[ 0 ][ 0 ] == board[ 1 ][ 1 ] &&
       board[ 0 ][ 0 ] == board[ 2 ][ 2 ] )
      return WIN;
   else if ( board[ 2 ][ 0 ] != ' ' && board[ 2 ][ 0 ] == board[ 1 ][ 1 ] &&
            board[ 2 ][ 0 ] == board[ 0 ][ 2 ] )
      return WIN;

   // check for win in rows
   for ( a = 0; a < 3; ++a )
      if ( board[ a ][ 0 ] != ' ' && board[ a ][ 0 ] == board[ a ][ 1 ] &&
           board[ a ][ 0 ] == board[ a ][ 2 ] )
         return WIN;

   // check for win in columns
   for ( a = 0; a < 3; ++a )
      if ( board[ 0 ][ a ] != ' ' && board[ 0 ][ a ] == board[ 1 ][ a ] &&
           board[ 0 ][ a ] == board[ 2 ][ a ] )
         return WIN;

   // check for a completed game
   for ( int r = 0; r < 3; ++r )
      for ( int c = 0; c < 3; ++c )
         if ( board[ r ][ c ] == ' ' )
            return CONTINUE; // game is not finished

   return DRAW; // game is a draw
}

void TicTacToe::printBoard( void ) 
{
   cout << "   0    1    2\n\n";

   for ( int r = 0; r < 3; ++r ) {
      cout << r;

      for ( int c = 0; c < 3; ++c ) {
         cout << setw( 3 ) << static_cast< char > ( board[ r ][ c ] );

         if ( c != 2 )
            cout << " |";
      }

      if ( r != 2 )
         cout << "\n ____|____|____"
              << "\n     |    |    \n";
   }

   cout << "\n\n";
}

void TicTacToe::makeMove( void )
{
   printBoard();

   while ( true ) {
      if ( xoMove( 'X' ) )
         break;
      else if ( xoMove( 'O' ) )
         break;
   }
}

bool TicTacToe::xoMove( int symbol )
{
   int x, y;
   
   do {
      cout << "Player " << static_cast< char >( symbol ) << " enter move: ";
      cin >> x >> y;
      cout << '\n';
   } while ( !validMove( x, y ) );

   board[ x ][ y ] = symbol;
   printBoard();
   Status xoStatus = gameStatus();

   if ( xoStatus == WIN ) {
      cout << "Player " << static_cast< char >( symbol ) << " wins!\n";
      return true;
   }
   else if ( xoStatus == DRAW ) {
      cout << "Game is a draw.\n";
      return true;
   }
   else // CONTINUE
      return false;   
}