Tic Tac Toe Game in C++

Tic Tac Toe Game in C++

In this article, we are going to create Tic Tac Toe Game in C++. This will be a simple console-based application in which the player can play the Tic Tac Toe game and also the player can choose from two available modes which are playing with a computer and playing with a friend. Even if you have little knowledge of C++, you will be able to follow this article and build this wonderful game. Let’s start

Features

  • Two game modes are available to play. First play with a computer and second play with a friend
  • Max score of both the player is updated after each round
  • The player can decide to replay the game after each round

Complete Code for Tic Tac Toe Game in C++

We will use Code::Blocks IDE to develop this application. Open the Code::Blocks IDE and create a new project with the name tictactoe, now in the main.cpp file paste the following code and run it.

#include <iostream>
#include<list>
#include <cstdlib>
#include<string>
#include <ctime>
using namespace std;

typedef struct{
    int *row;
}WinList;


class Player {
private:
    string name; // used to keep the name of current player
    int score;  // used to keep count of score of current player
public:
    Player() :Player {""}{}
    Player(string n) :score{0}, name{n}{}

    void won(){
        //increment the score
        score++;
    }

    //This method will return the score of current player
    int getScore(){
        return this->score;
    }

    //This method will return the name of current player
    string getName(){
         return this->name;
    }
};

class Game {
private:
    char board[9];
    int emptyIndex[9];
    int gameOn, againstComputer;
    int emptyCount;
    WinList winlist[8];

    //This method is used to display the playing board on the screen
    void displayBoard(){
        system("cls");
        cout<<"\t\t\t<=======================================>"<<endl;
        cout<<"\t\t\t             Welcome to the Game         "<<endl;
        cout<<"\t\t\t                 Tic Tac Toe             "<<endl;
        cout<<"\t\t\t<=======================================>"<<endl<<endl<<endl<<endl<<endl;
        cout <<endl;
        cout << "\t\t\t\t\t   |   |   "<<endl;
        cout << "\t\t\t\t\t "<< board[0] <<" | "<<board[1]<<" | "<<board[2]<<endl;
        cout << "\t\t\t\t\t   |   |   "<<endl;
        cout << "\t\t\t\t\t-----------"<<endl;
        cout << "\t\t\t\t\t   |   |   "<<endl;
        cout << "\t\t\t\t\t "<< board[3] <<" | "<<board[4]<<" | "<<board[5]<<endl;
        cout << "\t\t\t\t\t   |   |   "<<endl;
        cout << "\t\t\t\t\t-----------"<<endl;
        cout << "\t\t\t\t\t   |   |   "<<endl;
        cout << "\t\t\t\t\t "<< board[6] <<" | "<<board[7]<<" | "<<board[8]<<endl;
        cout << "\t\t\t\t\t   |   |   "<<endl;
        cout <<endl;
    }

    //This method is used to generate the input from the computer
    void computerInput(){
        int pos;
        pos = rand()%10; //generate any value between 1-9 randomly
        // check if this space is empty if not then retry otherwise place 'O' symbol at that place
        if(emptyIndex[pos] == 1){
            if(emptyCount < 0)
                return;
            computerInput();
        } else {
            cout<< "Computer choose: " << pos+1 << endl;
            emptyIndex[pos] =1;
            emptyCount-=1;
            board[pos] = 'O';
        }

    }

    //This method is used to take the input from the user and check if the inputed place is empty or not
    //If not empty then ask to enter again. If empty then simply place 'X' symbol
    void playerInput(Player &player){
        int pos;
        cout << endl;
        cout << "\t " << player.getName() <<" Turn"<<endl;
        cout <<"\t Enter the position(1-9):" << endl;
        cin >> pos;
        pos -=1;
        if(emptyIndex[pos] == 1){
            cout << "-----Position not empty-------"<< endl;
            playerInput(player);
        } else {
            emptyIndex[pos] =1;
            emptyCount-=1;
            player.getName().compare("Your") == 0 ? board[pos] ='X': board[pos] ='O';
        }

    }

    //This method is used to check the winning of any player
    void checkWin(Player &p1,Player &p2){
        int i,j,k;
        bool flag = false;
        char first_symbol;
        for(i=0; i<8; i++){
            first_symbol = board[winlist[i].row[0]];

            if((first_symbol != 'X') && (first_symbol != 'O')){
                flag = false;
                continue;
            }
            flag = true;
            for(j=0;j<3;j++){
                if(first_symbol != board[winlist[i].row[j]]){
                    flag = false;
                    break;
                }
            }
            if(flag){
                gameOn = 0;
                if(first_symbol == 'X'){
                    cout << "-----------------------"<< endl;
                    cout << "\t You WIN"<< endl;
                    cout << "-----------------------"<< endl;
                    p1.won();
                } else {
                    p2.won();
                    if(againstComputer){
                        cout << "-----------------------"<< endl;
                        cout << "\t Computer WON"<< endl;
                        cout << "-----------------------"<< endl;
                    } else {
                        cout << "-----------------------"<< endl;
                        cout << "\t Your friend WON"<< endl;
                        cout << "-----------------------"<< endl;

                    }
                }
                displayScore(p1,p2); //display the score of both the player
                break;
            }
        }
    }

    // This is the method which is called after the user has picked the mode
    void play(Player &p1,Player &p2){
        char rematch ='\0';
        int hand = 0;
        gameOn =1;
        displayBoard();
        while((emptyCount > 0) && (gameOn != 0)){

            if(againstComputer)
                hand == 1 ? computerInput(): playerInput(p2);
            else
                hand == 1 ? playerInput(p1): playerInput(p2);
            hand= !hand;
            displayBoard();
            checkWin(p1,p2);
        }
        if (emptyCount <=0){
            cout << "      -----------------------"<< endl;
            cout << "\t No WINNER"<< endl;
            cout << "      -----------------------"<< endl;
        }
        cout<< endl;
        cout << "Rematch Y/N: ";
        cin >> rematch;
        if((rematch == 'Y')||(rematch == 'y')){
            init();
            play(p1,p2);
        }

    }

    // This method is used to display the score on the screen
    void displayScore(Player &p1, Player &p2){
        cout << endl;
        cout << "\t SCORE: \t";
        if(againstComputer)
            cout<<" You: " <<p1.getScore()<<" \t Computer: "<<p2.getScore()<< endl;
        else
            cout<<" You: " <<p1.getScore()<<" \t Your friend: "<<p2.getScore()<< endl;
    }

public:
    Game(): emptyCount{0}, gameOn{1}, againstComputer{0}{
        init();
        winlist[0].row = new int[3]{0,1,2};
        winlist[1].row = new int[3]{3,4,5};
        winlist[2].row = new int[3]{6,7,8};
        winlist[3].row = new int[3]{0,3,6};
        winlist[4].row = new int[3]{1,4,7};
        winlist[5].row = new int[3]{2,5,8};
        winlist[6].row = new int[3]{0,4,8};
        winlist[7].row = new int[3]{2,4,6};
    }

    void init(){
        gameOn = 1;

        emptyCount =0;
        srand(time(0));
        for(size_t i=0; i<10; i++){
            emptyIndex[i] = 0;
            board[i] = ' ';
            emptyCount++;
        }
        emptyCount--;
    }

    //If one player game then set the first player to You and second player to computer
    void onePlayerGame(){
        //Creating Player
        Player p("Your");
        Player c("Computer");
        cout << "       -----------------------"<< endl;
        cout << "\t You: X \t Computer: O"<< endl;
        cout << "       -----------------------"<< endl;
        cout << endl;
        againstComputer = 1;
        play(c,p);

    }

    //If two player game then set the first player to You and second player to your friend
    void twoPlayerGame(){
        //Creating Player
        Player p("Your");
        Player c("Your friend");
        cout << "       -----------------------"<< endl;
        cout << "\t You: X \t Your friend: O"<< endl;
        cout << "       -----------------------"<< endl;
        cout << endl;
        againstComputer = 0;
        play(c,p);
    }
};

int main()
{
    system("color 0E");
    system("title Tic Tac Toe @copyassignment");
    int ch;

    while(1){
        cout<<"\t\t\t<=======================================>"<<endl;
        cout<<"\t\t\t             Welcome to the Game         "<<endl;
        cout<<"\t\t\t                 Tic Tac Toe             "<<endl;
        cout<<"\t\t\t<=======================================>"<<endl<<endl<<endl<<endl<<endl;
        cout<< "      <----------Please choose the Mode---------->" << endl << endl;
        cout << "\t 1. Play with computer" <<endl;
        cout << "\t 2. Play with friend" <<endl;
        cout << "\t 3. To exit " <<endl;
        cout <<"      <------------------------------------------>" << endl;
        cout << endl;
        cout <<"\t Select an option from above" << endl;
        cin >> ch;
        switch(ch){
        case 1:{
            Game *game = new Game;
            game->init();
            game->onePlayerGame();
            }
            break;
        case 2:{
            Game *game = new Game;
            game->init();
            game->twoPlayerGame();
            }
            break;
        case 3:
            return 0;
        default:
            cout << "Invalid Option! TRY AGAIN";
        }

    }
    return 0;
}

Output for Tic Tac Toe Game in C++

Image Output:

Output

Video Output:

Conclusion

We have built the Tic Tac Toe Game in C++ which is very simple to follow and develop. I hope you enjoyed building this cool game. Now it’s your turn to add more features in this game like asking the user for their name and instead of showing Your Turn, show the player’s name or change the terminal color and text by using different system method arguments.

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Author: Puja Kumari