○✕ゲーム

#include <stdio.h>
#include <windows.h>
#include <time.h>

int decision(char player, char table[3][3]);
int reach(char player, char table[3][3], int *n1, int *n2);
int draw(char table[3][3]);

int main(void) 
{
    char table[3][3];
    int i = 0, j = 0;
    char p1 = 'A', p2 = 'B';
    int count1 = 0, count2 = 0;
    int flag1 = 0, flag2 = 0, flag3 = 0;

    /*初期値の設定*/
    for (i = 0; i < 3; i++) 
    {
        for (j = 0; j < 3; j++)
        {
            *(table[i] + j) = '-';
        }
    }

    while (1)
    {
        /*リーチの確認(自分)*/
        flag1 = reach(p1, table, &i, &j);
        /*リーチの確認(相手)*/
        flag2 = reach(p2, table, &i, &j);
        /*引き分けの確認*/
        flag3 = draw(table);

        if (((flag1 == 0) && (flag2 == 0)) && (flag3 == 1))
        {
            break;
        }
        else
        {
            flag1 = flag2 = flag3 = 0;
        }

        printf("★現在の表★\n");
        printf("\n   0 1 2\n");
        printf("   ------\n");
        for (i = 0; i < 3; i++)
        {
            printf("%d|", i);
            for (j = 0; j < 3; j++)
            {
                printf("%2c", *(table[i] + j));
            }
            printf("\n");
        }

        /*入力の処理*/
        while (1)
        {
            /*入力の判定処理*/
            while (1) 
            {
                printf("先攻：%cさんの横(x)座標を入力：", p1);
                scanf_s("%d", &j);

                if ((0 <= j) && (j <= 2))
                {
                    break;
                }
                else 
                {
                printf("値が正しくありません。\n\n");
                }
            }

            /*入力の判定処理*/
            while (1) 
            {
                printf("先攻：%cさんの縦(y)座標を入力：", p1);
                scanf_s("%d", &i);
                printf("\n");

                if ((0 <= i) && (i <= 2)) 
                {
                    break;
                }
                else 
                {
                    printf("値が正しくありません。\n\n");
                }
            }

            /*表の中身の判定処理*/
            if (*(table[i] + j) == '-') 
            {
                *(table[i] + j) = p1;
                break;
            }
            else 
            {
                printf("指定の位置が正しくありません。\n\n");
            }
        }

        printf("★現在の表★\n");
        printf("\n   0 1 2\n");
        printf("   ------\n");
        for (i = 0; i < 3; i++)
        {
            printf("%d|", i);
            for (j = 0; j < 3; j++)
            {
                printf("%2c", *(table[i] + j));
            }
            printf("\n");
        }

        printf("\n");

        /*判定処理*/
        count1 = decision(p1, table);
        if (count1 == 3)
        {
            break;
        }

        /*入力の処理*/
        while (1)
        {
            /*リーチの確認(自分)*/
            flag1 = reach(p2, table, &i, &j);
            if (flag1 == 1)
            {
                break;
            }

            /*リーチの確認(相手)*/
            flag2 = reach(p1, table, &i, &j);
            if (flag2 == 1)
            {
                break;
            }

            /*真ん中の確認(後攻)*/
            i = 1;
            j = 1;

            if (table[i][j] == '-')
            {
                break;
            }

            while (1)
            {
                srand((unsigned int) time(NULL));
                j = rand() % 3;

                for (i = 0; i < 3; i++)
                {
                    if (table[i][j] == '-')
                    {
                        break;
                    }
                }

                if (table[i][j] == '-')
                {
                    break;
                }
            }

            /*引き分けの確認*/
            flag3 = draw(table);

            break;
        }
        if (flag3 == 1)
        {
            break;
        }

        printf("後攻：%cさんの横(x)座標を入力：", p2);
        printf("%d\n", j);

        printf("後攻：%cさんの縦(y)座標を入力：", p2);
        printf("%d\n", i);

        printf("\n");

        /*表の中身へ挿入*/
        table[i][j] = p2;

        /*判定処理*/
        count2 = decision(p2, table);

        if (count2 == 3)
        {
            break;
        }
    }

    /*先攻の判定処理*/
    if (count1 == 3) 
    {
        printf("%cさんの勝利！", p1);
    }

    /*後攻の判定処理*/
    else if (count2 == 3)
    {
        printf("★現在の表★\n");
        printf("\n   0 1 2\n");
        printf("   ------\n");
        for (i = 0; i < 3; i++)
        {
            printf("%d|", i);
            for (j = 0; j < 3; j++)
            {
                printf("%2c", table[i][j]);
            }
            printf("\n");
        }

        printf("%cさんの勝利！", p2);
    }
    else if (flag3 == 1)
    {
        printf("★現在の表★\n");
        printf("\n   0 1 2\n");
        printf("   ------\n");
        for (i = 0; i < 3; i++)
        {
            printf("%d|", i);
            for (j = 0; j < 3; j++)
            {
                printf("%2c", table[i][j]);
            }
            printf("\n");
        }

        printf("引き分け！");
    }

    return 0;
}

int decision(char player, char table[3][3])
{
    int i, j;
    int count = 0;

    while (1)
    {
        /*横の判定処理(後攻)*/
        for (i = 0; i < 3; i++) 
        {
            for (j = 0; j < 3; j++)
            {
                if (*(table[i] + j) == player)
                {
                    count++;
                }
            }

            if (count == 3)
            {
                break;
            }
            else 
            {
                count = 0;
            }
        }

        if (count == 3)
        {
            break;
        }

        /*縦の判定処理(後攻)*/
        for (j = 0; j < 3; j++)
        {
            for (i = 0; i < 3; i++) 
            {
                if (*(table[i] + j) == player)
                {
                    count++;
                }
            }

            if (count == 3)
            {
                break;
            }
            else
            {
                count = 0;
            }
        }

        if (count == 3)
        {
            break;
        }

        /*斜め右下がりの判定処理(後攻)*/
        for (i = 0, j = 0; i < 3; i++, j++)
        {
            if (*(table[i] + j) == player)
            {
                count++;
            }
        }

        if (count == 3) 
        {
            break;
        }
        else 
        {
            count = 0;
        }

        /*斜め左下がりの判定処理(後攻)*/
        for (i = 2, j = 0; i >= 0; i--, j++)
        {
            if (*(table[i] + j) == player)
            {
                count++;
            }
        }

        if (count == 3) 
        {
            break;
        }
        else
        {
            count = 0;
        }

        break;
    }

    return count;
}

int reach(char player, char table[3][3], int *n1, int *n2)
{
    int i, j;
    int count1 = 0, count2 = 0;
    int flag = 0; 

    while (1)
    {
        /*リーチ確認(横)*/
        for (i = 0; i < 3; i++)
        {
            for (j = 0; j < 3; j++)
            {
                if (*(table[i] + j) == '-')
                {
                    count1++;
                }
                else if (*(table[i] + j) == player)
                {
                    count2++;
                }   
            }

            if ((count1 == 1) && (count2 == 2))
            {
                flag = 1;

                break;
            }
            else
            {
                count1 = count2 = 0;
            }
        }

        if (flag == 1)
        {
            for (j = 0; j < 3; j++)
            {
                if (*(table[i] + j) == '-')
                {
                    count1 = count2 = 0;

                    break;
                }
            }

            break;
        }

        /*リーチ確認(縦)*/
        for (j = 0; j < 3; j++)
        {
            for (i = 0; i < 3; i++)
            {
                if (*(table[i] + j) == '-')
                {
                    count1++;
                }
                else if (*(table[i] + j) == player)
                {
                    count2++;
                }   
            }

            if ((count1 == 1) && (count2 == 2))
            {
                flag = 1;

                break;
            }
            else
            {
                count1 = count2 = 0;
            }
        }

        if (flag == 1)
        {
            for (i = 0; i < 3; i++)
            {
                if (*(table[i] + j) == '-')
                {
                    count1 = count2 = 0;

                    break;
                }
            }

            break;
        }

        /*リーチ確認(斜め右下がり)*/

        for (i = 0, j = 0; i < 3; i++, j++)
        {
            if (*(table[i] + j) == '-')
            {
                count1++;
            }
            else if (*(table[i] + j) == player)
            {
                count2++;
            }   
        }

        if ((count1 == 1) && (count2 == 2))
        {
            flag = 1;
        }
        else
        {
            count1 = count2 = 0;
        }

        if (flag == 1)
        {
            for (i = 0, j = 0; i < 3; i++, j++)
            {
                if (*(table[i] + j) == '-')
                {
                    count1 = count2 = 0;

                    break;
                }
            }

            break;
        }

        /*リーチ確認(斜め左下がり)*/
        for (i = 2, j = 0; i >= 0; i--, j++)
        {
            if (*(table[i] + j) == '-')
            {
                count1++;
            }
            else if (*(table[i] + j) == player)
            {
                count2++;
            }   
        }

        if ((count1 == 1) && (count2 == 2))
        {
            flag = 1;
        }
        else
        {
            count1 = count2 = 0;
        }

        if (flag == 1)
        {
            for (i = 2, j = 0; i >= 0; i--, j++)
            {
                if (*(table[i] + j) == '-')
                {               
                    count1 = count2 = 0;

                    break;
                }
            }

            break;
        }

        break;
    }

    if (flag == 1)
    {
        *n1 = i;
        *n2 = j;
        return flag;
    }
    else
    {
        return flag;
    }
}

int draw(char table[3][3])
{
    int i, j;
    int count = 0;
    int flag = 0;

    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            if (*(table[i] + j) == '-')
            {
                count++;
            }
        }
    }

    if (count <= 2)
    {
        flag = 1;
    }

    return flag;
}