#include <conio.h>
#include <stdio.h>

//グローバル変数
int gameover;// 1ならば終了
int board[3][3];//
int turn;//0ならば○の番 1ならば×の番
int count;//9になったらゲーム終了

//関数プロトタイプ宣言
void initialize(void);
void createboard(void);
void turnchange(void);
void pushbutton(void);
void check(void);


int main(void)
{
    initialize();
    while(!gameover) {
        pushbutton();
        turnchange();
        createboard();
        check();
    }
    return 0;
}

void initialize()
{
    int i, j;//forループ用変数

    count = 0;
    system("cls");
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
                board[i][j] = 10;
            
        }
    createboard();
    }
}

void createboard()
{
    int i, j;//forループ用変数

    system("cls");
    if(!turn)
        printf("○の番です\n\n");
    else
        printf("×の番です\n\n");
    for (i = 0; i < 3; i++) {
        for(j = 0; j < 3; j++) {
            switch(board[i][j]) {
                case 10:
                    printf("□");
                    break;
                case 0:
                    printf("○");
                    break;
                case 1:
                    printf("×");
            }
        }
    printf("\n");
    }
}

void pushbutton()
{
    int i, j;
    int endcheck = 0;//キー入力成功なら1

    do {
        switch(getch()) {
            case 'q':
                i = 0;
                j = 0;
                break;
            case 'w':
                i = 0;
                j = 1;
                break;
            case 'e':
                i = 0;
                j = 2;
                break;
            case 'a':
                i = 1;
                j = 0;
                break;
            case 's':
                i = 1;
                j = 1;
                break;
            case 'd':
                i = 1;
                j = 2;
                break;
            case 'z':
                i = 2;
                j = 0;
                break;
            case 'x':
                i = 2;
                j = 1;
                break;
            case 'c':
                i = 2;
                j = 2;
                break;
            default:
                i = -1;
        }
        if(i != -1) {
            if(board[i][j] == 10) {
                board[i][j] = turn;
                endcheck = 1;
            }
        }
    } while (!endcheck);
}

void turnchange()
{
    count++;
    if(turn)
        turn = 0;
    else
        turn = 1;
}

void check()
{
    if ((board[0][0] == 0 && board[0][1] == 0 && board[0][2] == 0)
        ||
        (board[1][0] == 0 && board[1][1] == 0 && board[1][2] == 0)
        ||
        (board[2][0] == 0 && board[2][1] == 0 && board[2][2] == 0)
        ||
        (board[0][0] == 0 && board[1][0] == 0 && board[2][0] == 0)
        ||
        (board[0][1] == 0 && board[1][1] == 0 && board[2][1] == 0)
        ||
        (board[0][2] == 0 && board[1][2] == 0 && board[2][2] == 0)
        ||
        (board[0][0] == 0 && board[1][1] == 0 && board[2][2] == 0)
        ||
        (board[0][2] == 0 && board[1][1] == 0 && board[2][0] == 0)) {
        printf("\n\n\n\n\n○の勝ち\n\n");
        gameover = 1;
    }
    else
    if ((board[0][0] == 1 && board[0][1] == 1 && board[0][2] == 1)
        ||
        (board[1][0] == 1 && board[1][1] == 1 && board[1][2] == 1)
        ||
        (board[2][0] == 1 && board[2][1] == 1 && board[2][2] == 1)
        ||
        (board[0][0] == 1 && board[1][0] == 1 && board[2][0] == 1)
        ||
        (board[0][1] == 1 && board[1][1] == 1 && board[2][1] == 1)
        ||
        (board[0][2] == 1 && board[1][2] == 1 && board[2][2] == 1)
        ||
        (board[0][0] == 1 && board[1][1] == 1 && board[2][2] == 1)
        ||
        (board[0][2] == 1 && board[1][1] == 1 && board[2][0] == 1)) {
        printf("\n\n\n\n\n×の勝ち\n\n");
        gameover = 1;
    }
    else if(count == 9) {
        printf("\n\n\n\n\n引き分け\n\n");
        gameover = 1;
    }
}