Write a C++ program that repeatedly reads in tic-tac-toe boards and for each one
ID: 3809582 • Letter: W
Question
Write a C++ program that repeatedly reads in tic-tac-toe boards and for each one indicates if there is a winner and who won.
The board will be read in as 3x3 array of characters (x, o or . for a blank spot).
You are required to write the following functions to help solve the problem:
// input prompts the user for a board and inputs it
// into the given array
void input (char board [3][3]);
// print prints the board in nice format
void print (char board [3][3]);
// win returns true if the given player has won on the
// given board, else it returns false
bool win (char board [3][3], char player);
You are required to use nested loops to write the functions input and print.
The back of this page shows a sample run of the program (input in bold). Your output should look at least as nice as that shown. You may assume that the board will be legal and there will be at most one winner.
Enter your board as characters (x, o or .):
o.x
..o
.x.
The board is:
o | | x
-----------
| | o
-----------
| x |
No winner!
Would you like to do another (y or n)? y
Enter your board as characters (x, o or .):
oxo
ox.
.xo
The board is:
o | x | o
-----------
o | x |
-----------
| x | o
X wins!
Would you like to do another (y or n)? y
Enter your board as characters (x, o or .):
xoo
xox
ox.
The board is:
x | o | o
-----------
x | o | x
-----------
o | x |
O wins!
Would you like to do another (y or n)? n
Thanks for playing!
Explanation / Answer
#include <iostream>
using namespace std;
char board[3][3];
void input(char board[3][3])
{
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++)
cin >> board[i][j]; // get input from user
}
}
void print(char board[3][3])
{
cout << "The board is:"<< endl;
int i = 0, j;
for (; i < 3; i++) {
j = 0;
for (; j < 2; j++)
cout << board[i][j] << " " << "|";// print board
cout << board[i][j] << endl;
if (i < 2)
cout << "--------------" << endl;
}
}
bool win(char board[3][3], char player)
{
// There are 8 cases in which a palyer can win, 3 horizontal, 3 vertical, 2 daigonal
return (
board[0][0] == player && board[0][1] == player && board[0][2] == player || // check for 1st row
board[1][0] == player && board[1][1] == player && board[1][2] == player || // check for 2nd row
board[2][0] == player && board[2][1] == player && board[2][2] == player || // check for 3rd row
board[0][0] == player && board[1][0] == player && board[2][0] == player || // check for 1st col
board[0][1] == player && board[1][1] == player && board[2][1] == player || // check for 2nd col
board[0][2] == player && board[1][2] == player && board[2][2] == player || // check for 3rd col
board[2][0] == player && board[1][1] == player && board[0][2] == player || // check for main diagonal
board[0][0] == player && board[1][1] == player && board[2][2] == player // check for other diagonal
);
}
int main()
{
char choice = 'y';
while(choice == 'y') {
char board[3][3];
cout << "Enter your board as characters (x, o or .):";
input(board);
print(board);
if (win(board, 'x'))
cout << "x Wins!" << endl;
else if (win(board, 'o'))
cout <<"o Wins!" << endl;
else
cout << "No Winner!"<< endl;
cout << "Would you like to do another (y or n)?";
cin >> choice;
}
return 0;
}
output:
sanjiv@sanjiv-VirtualBox:~$ g++ tic-tac.cpp -o tic
sanjiv@sanjiv-VirtualBox:~$
sanjiv@sanjiv-VirtualBox:~$ ./tic
Enter your board as characters (x, o or .):oxo
ox.
.xo
The board is:
o |x |o
----------
o |x |.
----------
. |x |o
x Wins!
Would you like to do another (y or n)?y
Enter your board as characters (x, o or .):xoo
xox
ox.
The board is:
x |o |o
----------
x |o |x
----------
o |x |.
o Wins!
Would you like to do another (y or n)?y
Enter your board as characters (x, o or .):o.x
..o
.x.
The board is:
o |. |x
-------
. |. |o
--------
. |x |.
No Winner!
Would you like to do another (y or n)?n
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