Tic Tac Toe

Tic Tac Toe with a 1 Dimensional Array

Video Summary: https://youtu.be/orX6bFQA44M

The goal of this exercise is to create a simple tic tac toe loop using an array of size 9. The numeric positions in the array would be as follows:

0|1|2 
------
3|4|5
------
6|7|8

To implement the game loop:

Create a character array of size 9 and initialize all the positions to blank with ' '
Create a void function named printGrid and pass it the character array. It should print the game grid every turn so players can see what moves are available
Create a loop for the game. Since there are 9 spaces on the grid, it will need to loop 9 times
Prompt the user for an array position. If it is an even turn, place an x in that position. If it is an odd turn, place an o
If the position was already filled (is not ' '), prompt the user again

You may assume the user will only enter valid input between 0 and 9. You do not need to try to determine a winner.

When you are finished, your output might look like this;

 | | 
------
 | | 
------
 | | 
Enter the array position for x
0
x| | 
------
 | | 
------
 | | 
Enter the array position for o
1
x|o| 
------
 | | 
------
 | | 
Enter the array position for x
2
x|o|x
------
 | | 
------
 | | 
Enter the array position for o
3
x|o|x
------
o| | 
------
 | | 
Enter the array position for x
4
x|o|x
------
o|x| 
------
 | | 
Enter the array position for o
5
x|o|x
------
o|x|o
------
 | | 
Enter the array position for x
6
x|o|x
------
o|x|o
------
x| | 
Enter the array position for o
7
x|o|x
------
o|x|o
------
x|o| 
Enter the array position for x
8
x|o|x
------
o|x|o
------
x|o|x

Solution

/*
Program name: tictactoe.cpp
Author: Devon Blewett
Purpose: This program replicates a single tic tac toe game using an array of size 9 and string formatting.

Written for the Open Textbooks program
*/
#include <iostream>
#include <iomanip>

using namespace std;
// Function to print the grid after every move to show the remaining spaces
void printGrid(char array[],  int size);

int main(){
    // size of the character array.  3 rows of 3 spaces = 9
    int size = 9;
    char array[size];
    // initialize the character array as blank
    for (int i = 0; i < 9; i++){
        array[i] = ' ';
    }
    // print the blank playing grid
    printGrid(array,size);
    // placeholder for where the user is trying to play their x or o
    int position;
    // for each position in the grid
    for(int i = 0; i < 9; i++){
        // if the iteration is even, it is x's turn
        if(i%2 == 0){
            cout << "Enter the array position for x" << endl;
            cin >> position;
        // if the space is already taken, prompt again
            while(array[position] != ' '){
                cout << "That space is already taken, try again" << endl;
                cin >> position;
            }
            // place x in that position of the array
            array[position] = 'x';
        }
        // else if the iteration is odd it is o's turn
        else{
            cout << "Enter the array position for o" << endl;
            cin >> position;

while(array[position] != ' '){
                cout << "That space is already taken, try again" << endl;
                cin >> position;
            }
            array[position] = 'o';
        }
    printGrid(array,size);
    }
    
}

/*
function name: printGrid
parameters: 1: Character array
            2: array size
purpose: Prints the tic tac toe game in a grid
*/
void printGrid(char array[], int size){
    cout << array[0] << '|' << array[1] << '|' << array[2] << endl;
    cout << setfill('-') << setw(6) << "" << endl;
    cout << array[3] << '|' << array[4] << '|' << array[5] << endl;
    cout << setfill('-') << setw(6) << "" << endl;
    cout << array[6] <<'|' << array[7] << '|' << array[8] << endl;    
}

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