cringetictactoe.c

#include <stdio.h>

// Blocks in map
char blk_1 = ' ';
char blk_2 = ' ';
char blk_3 = ' ';
char blk_4 = ' ';
char blk_5 = ' ';
char blk_6 = ' ';
char blk_7 = ' ';
char blk_8 = ' ';
char blk_9 = ' ';

// Player turn
int turn = 1;

// Tic Tac Toe map
void map(int, int);
// Check winner
int winner(void);

int main(void)
{
    // Print welcome message
    printf("Welcome to Tic Tac Toe Game!\n");
    printf("To indicate your move, please enter a number corresponding to the boxes as shown:\n");
    printf("[1][2][3]\n[4][5][6]\n[7][8][9]\n");

    // Loop for 9 turns
    for (int i = 0; i < 9; i++)
    {
        int move;
        // Get move from player
        printf("\nYour move:");
        scanf("%d", &move);

        // Make a move on the map
        map(move, turn);

        // Check if a player has won
        if (winner())
            break;

        // Next turn
        turn++;
    }
    return 0;
}

void map(int move, int turn)
{
    if (turn % 2 == 1)
    {
        // Symbol O
        if (move == 1)
            blk_1 = 'O';
        else if (move == 2)
            blk_2 = 'O';
        else if (move == 3)
            blk_3 = 'O';
        else if (move == 4)
            blk_4 = 'O';
        else if (move == 5)
            blk_5 = 'O';
        else if (move == 6)
            blk_6 = 'O';
        else if (move == 7)
            blk_7 = 'O';
        else if (move == 8)
            blk_8 = 'O';
        else
            blk_9 = 'O';
    }
    else
    {
        // Symbol X
        if (move == 1)
            blk_1 = 'X';
        else if (move == 2)
            blk_2 = 'X';
        else if (move == 3)
            blk_3 = 'X';
        else if (move == 4)
            blk_4 = 'X';
        else if (move == 5)
            blk_5 = 'X';
        else if (move == 6)
            blk_6 = 'X';
        else if (move == 7)
            blk_7 = 'X';
        else if (move == 8)
            blk_8 = 'X';
        else
            blk_9 = 'X';
    }
    printf("\n[%c][%c][%c]\n[%c][%c][%c]\n[%c][%c][%c]\n", blk_1, blk_2, blk_3, blk_4, blk_5, blk_6, blk_7, blk_8, blk_9);
}

int winner(void)
{
    // Compute row sums
    int row_sum_1 = blk_1 + blk_2 + blk_3;
    int row_sum_2 = blk_4 + blk_5 + blk_6;
    int row_sum_3 = blk_7 + blk_8 + blk_9;

    // Compute column sums
    int col_sum_1 = blk_1 + blk_4 + blk_7;
    int col_sum_2 = blk_2 + blk_5 + blk_8;
    int col_sum_3 = blk_3 + blk_6 + blk_9;

    // Compute diagonal sums
    int dig_sum_1 = blk_1 + blk_5 + blk_9;
    int dig_sum_2 = blk_3 + blk_5 + blk_7;

    // Check if player 1 or 2 won by checking modulus of row, col. and diag. sums
    if (row_sum_1 % 'O' == 0 || row_sum_2 % 'O' == 0 || row_sum_3 % 'O' == 0 || col_sum_1 % 'O' == 0 || col_sum_2 % 'O' == 0 || col_sum_3 % 'O' == 0 || dig_sum_1 % 'O' == 0 || dig_sum_2 % 'O' == 0)
    {
        printf("Player 1 won!");
        return 1;
    }
    else if (row_sum_1 % 'X' == 0 || row_sum_2 % 'X' == 0 || row_sum_3 % 'X' == 0 || col_sum_1 % 'X' == 0 || col_sum_2 % 'X' == 0 || col_sum_3 % 'X' == 0 || dig_sum_1 % 'X' == 0 || dig_sum_2 % 'X' == 0)
    {
        printf("Player 2 won!");
        return 1;
    }
    else if (turn == 9)
    {
        // No sum has modulus equal to zero and all turns are complete
        printf("Tie!");
        return 1;
    }
    else
        return 0;
}