Tic Tac Toe in C++

 A simple tic tac toe program in C++ programming language.

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Program Listing

#include <iostream>
using namespace std;

char board[3][3] = {{'1','2','3'}, {'4','5','6'}, {'7','8','9'}};
int player = 1;
char mark;

void draw_board() {
    cout << "Tic Tac Toe Game in C++" << endl;
    for(int i = 0; i < 3; i++) {
        for(int j = 0; j < 3; j++) {
            cout << board[i][j] << " ";
        }
        cout << endl;
    }
}

void player_turn() {
    int choice;
    if(player % 2 == 1) {
        cout << "Player 1 turn (X): ";
    } else {
        cout << "Player 2 turn (O): ";
    }
    cin >> choice;

    switch(choice) {
        case 1: mark = 'X'; board[0][0] = mark; break;
        case 2: mark = 'X'; board[0][1] = mark; break;
        case 3: mark = 'X'; board[0][2] = mark; break;
        case 4: mark = 'X'; board[1][0] = mark; break;
        case 5: mark = 'X'; board[1][1] = mark; break;
        case 6: mark = 'X'; board[1][2] = mark; break;
        case 7: mark = 'X'; board[2][0] = mark; break;
        case 8: mark = 'X'; board[2][1] = mark; break;
        case 9: mark = 'X'; board[2][2] = mark; break;
        default:
            cout << "Invalid move" << endl;
            player_turn();
    }
}

bool game_over() {
    // Check rows
    for(int i = 0; i < 3; i++) {
        if(board[i][0] == board[i][1] && board[i][1] == board[i][2]) {
            return true;
        }
    }
    // Check columns
    for(int j = 0; j < 3; j++) {
        if(board[0][j] == board[1][j] && board[1][j] == board[2][j]) {
            return true;
        }
    }
    // Check diagonals
    if(board[0][0] == board[1][1] && board[1][1] == board[2][2]) {
        return true;
    }
    if(board[0][2] == board[1][1] && board[1][1] == board[2][0]) {
        return true;
    }

    return false;
}

int main() {
    draw_board();
    while(!game_over()) {
        player_turn();
        draw_board();
        player++;
    }
    if(player % 2 == 1) {
        cout << "Player 2 wins!" << endl;
    } else {
        cout << "Player 1 wins!" << endl;
    }
    return 0;
}