Write a program that allows two players to play a game of tic-tac-toe. Us a two-

Question

Write a program that allows two players to play a game of tic-tac-toe. Us a two-dimensional char array with three rows and three columns as the game board. Each element of the array should be initialized with an asterisk (*). The program should run a loop that

• Displays the contents of the board array
• Allows player 1 to select a location on the board for an X. The program should ask the user to enter the row and column number.
• Allows player 2 to select a location on the board for an O. The program should ask the user to enter the row and column number.
• Determines whether a player has won, or a tie has occurred. If a player has won, the program should declare that player the winner and end. If a tie has occurred, the program should say so and ask if they would like to play another game.
• A player wins when there are three Xs in a row on the game board. The Xs can appear in a row, in a column, or diagonally across the board. A tie occurs when all of the locations on the board are full, but there is no winner.

Explanation / Answer

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#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
void initializeBoard(char board[][3]);
void displayBoard(char board[][3]);/*gets input from user returns character number of location chosen by user*/
void getInput(char board[][3], char marker,int& x,int& y);/* mark character marker of player on chosen character pos of board*/
void markBoard(char board[][3],int x,int y, char marker);/*checks to see if someone has won returns true or false*/
bool gameOver(char board[][3]); /*checks to see if someone won on rows of board*/
bool checkHorizontal(char board[][3], char marker);/*checks to see if someone won on columns of board*/
bool checkVertical(char board[][3], char marker);/*checks to see if someone won on diagonal of board*/
bool checkDiagonal(char board[][3], char marker);/*checks to see if players have tied*/
bool checkTie(char board[][3]);/*prints winner as marker or ties*/
void printWinner(char marker);/*checks to see if selected location is available returns false when location has already been taken or is an invalid number*/
bool validMove(char board[][3], int x,int y);
int main()
{ srand(time(0));
int start=rand()%2;
char board[3][3];
char   exit;
char f,s;
int x,y;
f='X';
s='O';
initializeBoard(board);
displayBoard(board);
while(true)
{getInput(board,f,x,y);
markBoard(board, x,y, f);
displayBoard(board);
if (gameOver(board))
    break;
getInput(board,s,x,y);
markBoard(board, x,y, s);
displayBoard(board);
if (gameOver(board))
    break;
}
system("pause");
return 0;
}
void initializeBoard(char board[][3])
{
for (int i = 0; i<3; i++)
    for (int j = 0; j<3; j++)
        board[i][j]= '*';
}
bool validMove(char board[][3], int x, int y)
{if(x<0||x>2||y<0||y>2)
     return false;
if(board[x][y]=='X'||board[x][y]=='O')
      return false;
else
      return true;

}
void displayBoard(char board[][3])
{ int t;
for(t=0; t<3; t++) {
cout<<" "<<board[t][0]<<" | "<< board[t][1]<<" | "<< board[t][2];   
    if(t!=2) cout<<" ---|---|--- ";
}
cout<<" ";
}

void getInput(char board[][3], char marker,int& x,int& y)
{for(;;)
   {cout << "Player "<< marker << " Enter a Row and Column (between 1-3): ";
    cin >> x>>y;
    x--;
    y--;
    if (validMove(board,x,y))
      return;
      cout << "Invalid Move: Please Try Again ";
    }
}

void markBoard(char board[][3], int x,int y, char marker)
{ board[x][y]=marker;
}

bool gameOver(char board[][3])
{if (checkHorizontal(board,'X'))
     {printWinner('X');
     return true;
     }
if (checkVertical(board, 'X'))
    {printWinner('X');
     return true;
    }
if (checkDiagonal(board, 'X'))
   { printWinner('X');
     return true;
   }
if (checkHorizontal(board,'O'))
   {printWinner('O');
    return true;
   }
if (checkVertical(board, 'O'))
    {printWinner('O');
    return true;
   }
if (checkDiagonal(board, 'O'))
   {printWinner('O');
    return true;
   }
if (checkTie(board))
   {printWinner('T');
    return true;
   }
return false;
}
bool checkHorizontal(char board[][3], char marker)
{int i,j,count;
for(i=0; i<3; i++)
   {count=0;
    for(j=0;j<3;j++)
       if(board[i][j]==marker)
           count++;
    if(count==3)
          return true;
    }
return false;
}
bool checkVertical(char board[][3], char marker)
{int i,j,count;
for(i=0; i<3; i++)
   {count=0;
    for(j=0;j<3;j++)
       if(board[j][i]==marker)
           count++;
    if(count==3)
          return true;
    }
return false;
     
}
bool checkDiagonal(char board[][3], char marker)
{if(board[0][0]==board[1][1] && board[1][1]==board[2][2]&& board[0][0]==marker)
          return true;
if(board[0][2]==board[1][1] && board[1][1]==board[2][0]&& board[0][2]==marker)
           return true;
return false;
}
bool checkTie(char board[][3])
{int i,j;
for(i=0;i<3;i++)
     for(j=0;j<3;j++)
          if(board[i][j]=='*')
                return false;
return true;
}
void printWinner(char marker)
{ if(marker=='T')
     cout<<"TIE GAME! ";
else
     cout<<"The winner is "<<marker<<"!!! ";
}

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