A Tic Tac Toe Game

Question

countrygirl1970 0 Newbie Poster

14 Years Ago

Hello everyone,

I am having a slight problem in my function "startGame". My code works on Bloodshed and the code does compile. I am trying to refine the part on making sure that only a number gets input and not a letter or any other key gets input. I have try a couple different ways and it is not coming out the way I think it should. I have tried a do/while loop and a if/else statement. Does anyone have a sugestion.

#include <iostream>
#include <cstdlib>
using namespace std;
class ticTac
{
      private:
             int counter;
             char posn[9];
             char player;
      public:
             void nextPlayer();
             char getPlayer();
             void newBoard();
             void startGame();
             char checkWinner();
             bool checkPosn(int spot, char player);
             void updateBoard();
                                     
};
 
int main()
{
    char ch;
    ticTac Toe;
    do{
           Toe.newBoard();         //Brings up the new board
           Toe.startGame();        //Starts the new game
           cout << "Would you like to play again (Enter 'y')? ";
           cin >> ch;
           }while (ch == 'y');
 
    return 0;    
}

//The new board before the game starts
void ticTac::newBoard()
{
 
     char posndef[9] = {'0', '1', '2', '3', '4', '5', '6', '7', '8'};
     int i;
     counter = 0;
     player = 'x';
     for (i=0; i<9; i++) posn[i]=posndef[i];
     return;
 
}

//This will update the board with the 'X' or 'O'
void ticTac::updateBoard()
{
     cout << "\n\n" <<endl;
     cout << "\n\n\t\t" <<posn [0]<< "   | " <<posn [1]<< "  | " <<posn [2]<<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << " \t\t ___|____|___ " <<endl;
     cout << "\n\n\t\t" <<posn [3]<< "   | " <<posn [4]<< "  | " <<posn [5]<<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << " \t\t ___|____|___ " <<endl;
     cout << "\n\n\t\t" <<posn [6]<< "   | " <<posn [7]<< "  | " <<posn [8]<<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << "\n" <<endl;
      
}

//Starts the game
void ticTac::startGame()
{
     int spot;
     char blank = ' ';
     bool result = false;
     char posndef[9] = {'0', '1', '2', '3', '4', '5', '6', '7', '8'};
      
     cout << "\n\nPlayer " << getPlayer() <<" will be the first to play." <<endl;
 
     do {
         updateBoard();              // display update board   
 
         cout << "Player " << getPlayer() <<" choose a position between (0 - 8)." <<endl;
         cin >> spot;
          
         if (spot < 0 || spot > 8)
         {
              cout << "Invalid position! Please input a number of 0 thru 8." <<endl;
              continue;}
              
          
                                
         result = checkPosn(spot, getPlayer());            // to check if the position is taken
                      
         system("CLS"); 
         
         if (result == false){
             nextPlayer(); }
          
         if(checkWinner() == 'x' || checkWinner() == 'o' || checkWinner () == 't')
             blank = 'v';
         }
         while ( blank != 'v' );

 
         return;
 
}

//Checks to see who the winner will be     
char ticTac::checkWinner()
{
     char game = ' ';
     int check = 1;
 
     // Check if X wins   
     if (posn[0] == 'x' && posn[1] == 'x' && posn[2] == 'x') game = 'x';
     if (posn[3] == 'x' && posn[4] == 'x' && posn[5] == 'x') game = 'x';
     if (posn[6] == 'x' && posn[7] == 'x' && posn[8] == 'x') game = 'x';
     if (posn[0] == 'x' && posn[3] == 'x' && posn[6] == 'x') game = 'x';
     if (posn[1] == 'x' && posn[4] == 'x' && posn[7] == 'x') game = 'x';
     if (posn[2] == 'x' && posn[5] == 'x' && posn[8] == 'x') game = 'x';
     if (posn[0] == 'x' && posn[4] == 'x' && posn[8] == 'x') game = 'x';
     if (posn[2] == 'x' && posn[4] == 'x' && posn[6] == 'x') game = 'x';
     if (game == 'x' )  
       {cout << "Player1 wins the game." <<endl; return game; };
 
     // Check if O wins     
     if (posn[0] == 'o' && posn[1] == 'o' && posn[2] == 'o') game = 'o';
     if (posn[3] == 'o' && posn[4] == 'o' && posn[5] == 'o') game = 'o';
     if (posn[6] == 'o' && posn[7] == 'o' && posn[8] == 'o') game = 'o';
     if (posn[0] == 'o' && posn[3] == 'o' && posn[6] == 'o') game = 'o';
     if (posn[1] == 'o' && posn[4] == 'o' && posn[7] == 'o') game = 'o';
     if (posn[2] == 'o' && posn[5] == 'o' && posn[8] == 'o') game = 'o';
     if (posn[0] == 'o' && posn[4] == 'o' && posn[8] == 'o') game = 'o';
     if (posn[2] == 'o' && posn[4] == 'o' && posn[6] == 'o') game = 'o';
     if (game == 'o' )
       {cout << "Player2 wins the game." <<endl; return game; };
     
     for(int i = 0; i < 8; i++ ){
         if(posn[i] >= '1' && posn[i] <= '8' ){
             check = 0;
             break;
            } 
      } 
              
     // Check if tie
     if (game != 'x' && game != 'o' && check == 1) game = 't';
     if (game == 't')
        {cout << "Tie Game." <<endl; return game; };
      

          
     
     
     
     return game;        
}

//Checks to see if the position is taken     
bool ticTac::checkPosn(int spot, char player)
{
 
     if (posn[spot] == 'x' || posn[spot] == 'o'){
          cout << "Position already taken, please choose another position." <<endl;
          system ("pause");
          return true;
          }
          else {
                    posn[spot] = player;
                    cout << "Nice move." <<endl;
                    system ("pause");
                    counter++;
                    return false;
                   
          }
 
     
 
     return false;
 
}

//Tells the next player that it's thier turn
void ticTac::nextPlayer()
{
     if (player == 'x')
         player = 'o';
     else player = 'x';
     return;
}

//This switches between players         
char ticTac::getPlayer()
{
     return player;
}

c++

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Latest Post 14 Years Ago Latest Post by countrygirl1970

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Lerner 582 Nearly a Posting Maven

14 Years Ago

Focus your code posting to just the pertinent part. sometimes it's hard to know where that is, but in your case it shouldn't be.

Sounds like a do/while loop using something like isdigit() might work if the numerical input is from 0-9.

Otherwise you could check the state of the stream after attempted input. If it is still a valid stream then the input was valid. If not, it wasn't and you will need to ignore the invalid input part and reset the stream.

As a further alternative you could accept input only as a string and then scan the string char by char for validity.

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countrygirl1970 0 Newbie Poster · Answer 1 · 2009-10-13T00:21:27+00:00

Thank you for the info. I will try that. Again thank you.

countrygirl1970 0 Newbie Poster · Answer 2 · 2009-10-15T02:51:08+00:00

I am almost finished with this code. I am able to compile and when I input a number like 7 the 'x'' is placed in the zero position. What did I miss.

#include <iostream>
#include <cstdlib>
#include <cctype>

using namespace std;
class ticTac
{
      private:
             int counter;
             char posn[9];
             char player;
      public:
             void nextPlayer();
             char getPlayer();
             void newBoard();
             void startGame();
             char checkWinner();
             bool checkPosn(int spot, char player);
             void updateBoard();
                                     
};// end class ticTac
 
int main()
{
    char ch;
    ticTac Toe;
    do{
           Toe.newBoard();         //Brings up the new board
           Toe.startGame();        //Starts the new game
           cout << "Would you like to play again (Enter 'y')? ";
           cin >> ch;              // places the user input into response variable
           }while (ch == 'y');
 
    return 0;    
}// end main

//The new board before the game starts
void ticTac::newBoard()
{
 
     char posndef[9] = {'0', '1', '2', '3', '4', '5', '6', '7', '8'};
     int i;
     counter = 0;
     player = 'x';
     for (i=0; i<9; i++) posn[i]=posndef[i];
     return;
 
}// end function newBoard

//This will update the board with the 'X' or 'O'
void ticTac::updateBoard()
{
     cout << "\n\n" <<endl;
     cout << "\n\n\t\t" <<posn [0]<< "   | " <<posn [1]<< "  | " <<posn [2]<<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << " \t\t ___|____|___ " <<endl;
     cout << "\n\n\t\t" <<posn [3]<< "   | " <<posn [4]<< "  | " <<posn [5]<<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << " \t\t ___|____|___ " <<endl;
     cout << "\n\n\t\t" <<posn [6]<< "   | " <<posn [7]<< "  | " <<posn [8]<<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << " \t\t    |    |   " <<endl;
     cout << "\n" <<endl;
      
}// end funtion updateBoard

//Starts the game
void ticTac::startGame()
{
     char input;
     int spot;
     char blank = ' ';
     bool result = false;
     char posndef[9] = {'0', '1', '2', '3', '4', '5', '6', '7', '8'};
      
     cout << "\n\nPlayer " << getPlayer() <<" will be the first to play." <<endl;
 
     do {
         updateBoard();              // display update board   
 
         cout << "Player " << getPlayer() <<" choose a position between (0 - 8)." <<endl;
         cin >> input;                // places the user input into response variable
          
         if (isdigit(input))cout << " " << endl;
             else {cout << "Invalid input, Please try again" << endl;
             continue;
                          }
         int spot = atoi ( input + " " );              
         result = checkPosn(spot, getPlayer());            // to check if the position is taken
                      
         system("CLS"); 
         
         if (result == false){
             nextPlayer(); }
          
         if(checkWinner() == 'x' || checkWinner() == 'o' || checkWinner () == 't')
             blank = 'v';
         }
         while ( blank != 'v' );

 
         return;
 
}// end funtion startGame

//Checks to see who the winner will be     
char ticTac::checkWinner()
{
     char game = ' ';
     int check = 1;
 
     // Check if X wins   
     if (posn[0] == 'x' && posn[1] == 'x' && posn[2] == 'x') game = 'x';
     if (posn[3] == 'x' && posn[4] == 'x' && posn[5] == 'x') game = 'x';
     if (posn[6] == 'x' && posn[7] == 'x' && posn[8] == 'x') game = 'x';
     if (posn[0] == 'x' && posn[3] == 'x' && posn[6] == 'x') game = 'x';
     if (posn[1] == 'x' && posn[4] == 'x' && posn[7] == 'x') game = 'x';
     if (posn[2] == 'x' && posn[5] == 'x' && posn[8] == 'x') game = 'x';
     if (posn[0] == 'x' && posn[4] == 'x' && posn[8] == 'x') game = 'x';
     if (posn[2] == 'x' && posn[4] == 'x' && posn[6] == 'x') game = 'x';
     if (game == 'x' )  
       {cout << "Player1 wins the game." <<endl; return game; };
 
     // Check if O wins     
     if (posn[0] == 'o' && posn[1] == 'o' && posn[2] == 'o') game = 'o';
     if (posn[3] == 'o' && posn[4] == 'o' && posn[5] == 'o') game = 'o';
     if (posn[6] == 'o' && posn[7] == 'o' && posn[8] == 'o') game = 'o';
     if (posn[0] == 'o' && posn[3] == 'o' && posn[6] == 'o') game = 'o';
     if (posn[1] == 'o' && posn[4] == 'o' && posn[7] == 'o') game = 'o';
     if (posn[2] == 'o' && posn[5] == 'o' && posn[8] == 'o') game = 'o';
     if (posn[0] == 'o' && posn[4] == 'o' && posn[8] == 'o') game = 'o';
     if (posn[2] == 'o' && posn[4] == 'o' && posn[6] == 'o') game = 'o';
     if (game == 'o' )
       {cout << "Player2 wins the game." <<endl; return game; };
     
     for(int i = 0; i < 8; i++ ){
         if(posn[i] >= '1' && posn[i] <= '8' ){
             check = 0;
             break;
            } 
      } 
              
     // Check if tie
     if (game != 'x' && game != 'o' && check == 1) game = 't';
     if (game == 't')
        {cout << "Tie Game." <<endl; return game; };
      

          
     
     
     
     return game;        
}// end funtion checkWinner

//Checks to see if the position is taken     
bool ticTac::checkPosn(int spot, char player)
{
 
     if (posn[spot] == 'x' || posn[spot] == 'o'){
          cout << "Position already taken, please choose another position." <<endl;
          system ("pause");
          return true;
          }
          else {
                    posn[spot] = player;
                    cout << "Nice move." <<endl;
                    system ("pause");
                    counter++;
                    return false;
                   
          }
 
     
 
     return false;
 
}// end funtion checkPosn

//Tells the next player that it's thier turn
void ticTac::nextPlayer()
{
     if (player == 'x')
         player = 'o';
     else player = 'x';
     return;
}// end funtion nextPlayer

//This switches between players         
char ticTac::getPlayer()
{
     return player;
}// end funtion getPlayer

A Tic Tac Toe Game

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