Question

c++ help please!

1. Create a 2D character array in your main function and use nested for loops to fill the array with the letter ‘e’ to represent empty spaces.

2. Create a function to print the board on the screen using a nested for loop. The function header is:
   void printBoard (char board [][3])

3. Create a function that checks whether a particular space has already been filled. If the space is filled it returns a boolean value of true, otherwise false. (No loops required.) Here is the function header:
   bool isFilled (char board [][3], int row, int col)

4. Write a function to prompt the user for their next move. The function should validate that the move is legal and then update the board to reflect the move (hint: arrays are always passed by reference). A move is valid if the values of row and col are both numbers between 0 and 2 and the space is not already filled (hint: you have a function to do part of this). The parameter player will be ‘X’ if the function is to get X’s move and ‘O’ if it is to get O’s move. The function header is:
   void move (char board [][3], char player)

5. Demo your program for me … you’ll need to have main() modify the board and call your functions for testing purposes. Don’t move on until you get credit for the required part of the lab!

6. Create a function to detect whether it is game over: either someone has won or a stalemate has been reached. If you’re short on time, you could just ask the user. If you have enough time, test to see whether any of the rows, columns or diagonals contains all Xs or all Os and print out a congratulatory message. Return true if the function finds a winner or if the board is completely full and false otherwise. The function header is:
   bool isGameOver(char board[][3])

7. Put all the function calls together in main ( ) and alternate getting a move from player X and player O until someone wins.

C C:\Windows\system32\cmd.exe Player 0: please enter the coordinates of your nove (row col): 1 8 X e e ре е e e e Player X: please enter the coordinates of your nove crow col): 1 1 охе е е е Player 0: please enter the coordinates of your move (row col): 1 1 Invalid nove! That cell is already taken! Player 0: please enter the coordinates of your nove (row col): 2 охе Xe e o e e Player X: please enter the coordinates of your nove (row col): 2 2 ке е охе 0eX Player X has wont Press any key to continue

Answer 1

Program Code [C++]

#include <iostream>
using namespace std;

char player = 'O';
  
// printBoard function

void printBoard(char board[][3]) {
  
   for (int i=0; i<3; i++) {
       for (int j=0; j<3; j++)
           cout << board[i][j] << " ";
       cout << endl;
   }
}

// isFilled function

bool isFilled(char board[][3], int row, int col) {
  
   // Determine whether particular space is occupied or not
  
   if(board[row][col] != 'e')
       return true;
   else
       return false;
}

// move function

void move(char board[][3], char player) {
  
   // Asking user for their move
  
   cout << "Player " << player << ": please enter the coordinates of your move <row col>: ";
   int row, col;
   cin >> row >> col;
  
   while(!((row >=0 && row <=2) && (col >=0 && col <= 2) && !(isFilled(board, row, col)))) {

       cout << "Invalid move! That cell is already taken!" << endl;
       cout << "\nPlayer " << player << ": please enter the coordinates of your move <row col>: ";
       cin >> row >> col;
   }
  
   board[row][col] = player;
}

// isGameOver function

bool isGameOver(char board[][3]) {

   // Testing whether any rows, cols or diagonals contain all Xs or Os
  
   // Checking for all rows

   for (int i=0; i<3; i++)
       if((board[0][i] == board[1][i]) && (board[1][i] == board[2][i]) &&
           (board[0][i] == board[2][i]) && board[0][i] != 'e') {
               cout << "Player " << player << " has won!" << endl;
               return true;
           }
      
   // Checking for same rows

   for (int i=0; i<3; i++)
       if((board[i][0] == board[i][1]) && (board[i][1] == board[i][2]) &&
           (board[i][0] == board[i][2]) && board[i][0] != 'e') {
               cout << "Player " << player << " has won!" << endl;
               return true;
           }

   // Checking for diagnoals
   if((board[0][0] == board[1][1]) && (board[1][1] == board[2][2]) && (board[0][0] == board[2][2]) && board[0][0] != 'e') {
       cout << "Player " << player << " has won!" << endl;
       return true;
   }

   if((board[2][0] == board[1][1]) && (board[1][1] == board[0][2]) && (board[2][0] == board[0][2]) && board[2][0] != 'e') {
       cout << "Player " << player << " has won!" << endl;
       return true;
   }
              
   // Checking whether board is filled or not

   for (int i=0; i<3; i++)
       for (int j=0; j<3; j++)
           if(!isFilled(board, i, j)) {
               return false;
           }
          
   return true;
}

int main() {

   // Creating 2D Array
  
   char board[3][3];
  
   // Using nested loop to fill array with letter e
  
   for (int i=0; i<3; i++) {
      
       for (int j=0; j<3; j++)
           board[i][j] = 'e';
   }

   while(!isGameOver(board)) {
      
       if(player == 'X')
           player = 'O';
       else
           player = 'X';
      
       move(board, player);
      
       printBoard(board);
   }
  
   return 0;
}

Sample Output:-

C:\Users\Dell OneDrive\Desktop\OCT 2020\Board.exe Player x: please enter the coordinates of your move <row cols: 0 0 хе е е е е е е е е е е player o: please enter the coordinates of your move <row col): 10 Xee Оee Player x: please enter the coordinates of your move <row col: 11 хее охе e_ee Player o: please enter the coordinates of your move <row col: 11 Invalid move! That cell is already taken! Player o: please enter the coordinates of your move <row col>: 20 хе е охе Oе е Player X: please enter the coordinates of your move <row col>: 2 2 хе е охе Оe X Player x has won! Process exited after 31.88 seconds with return value o Press any key to continue

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