game.h

#ifndef __GAME_H__
#define __GAME_H__
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define ROWS 3
#define COLS 3


void init_board(char board[ROWS][COLS], int row, int col);
void display_board(char board[ROWS][COLS], int row, int col);
void player_move(char board[ROWS][COLS], int row, int col);
void computer_move(char board[ROWS][COLS], int row, int col);
char check_win(char board[ROWS][COLS], int row, int col);

#endif //__GAME_H__

game.c

#define _CRT_SECURE_NO_WARNINGS 1
#include"game.h"
void init_board(char board[ROWS][COLS], int row, int col)
{
    memset(board, ' ', row*col);
}
void display_board(char board[ROWS][COLS], int row, int col)
{
    int i = 0;
    for (i = 0; i<row; i++)
    {
        printf(" %c | %c | %c \n", board[i][0], board[i][1], board[i][2]);
        if (i != 2)
            printf("---|---|---\n");
    }
}
void player_move(char board[ROWS][COLS], int row, int col)
{
    int x = 0;
    int y = 0;
    while (1)
    {
        printf("请输入坐标：");
        scanf("%d%d", &x, &y);
        x--;
        y--;
        if (((x >= 0) && (x <= 2)) && ((y >= 0) && (y <= 2)))
        {
            if (board[x][y] == ' ')
            {
                board[x][y] = 'X';
                break;

            }
            else
            {
                printf("输入有误 ！");
            }
        }
        else
        {
            printf("输入有误 ！");
        }
    }
}
void computer_move(char board[ROWS][COLS], int row, int col)
{
    printf("电脑下：\n");
    while (1)
    {
        int x = rand() % 3;
        int y = rand() % 3;
        if (board[x][y] == ' ')
        {
            board[x][y] = 'O';
            break;
        }
    }
}
static int is_full(char board[ROWS][COLS], int row, int col)
{
    int i = 0;
    int j = 0;
    for (i = 0; i<row; i++)
    {
        for (j = 0; j<col; j++)
        {
            if (board[i][j] == ' ')
                return 0;
        }
    }
    return 1;
}
char check_win(char board[ROWS][COLS], int row, int col)
{
    int i = 0;
    for (i = 0; i<row; i++)
    {
        if ((board[i][0] == board[i][1])
            && (board[i][1] == board[i][2])
            && (board[i][1] != ' '))
            return board[i][1];
    }
    for (i = 0; i<col; i++)
    {
        if ((board[0][i] == board[1][i])
            && (board[1][i] == board[2][i])
            && (board[1][i] != ' '))
            return board[1][i];
    }
    if ((board[0][0] == board[1][1])
        && (board[1][1] == board[2][2])
        && (board[1][1] != ' '))
        return board[1][1];
    if ((board[0][2] == board[1][1])
        && (board[1][1] == board[2][0])
        && (board[1][1] != ' '))
        return board[1][1];
    if (is_full(board, row, col))
    {
        return 'q';
    }
    return ' ';
}

test.c

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#include"game.h"
void game()
{
    int ret = 0;
    char board[ROWS][COLS] = { 0 };
    init_board(board, ROWS, COLS);
    display_board(board, ROWS, COLS);
    srand((unsigned int)time(NULL));
    while (1)
    {
        player_move(board, ROWS, COLS);
        if ((ret = check_win(board, ROWS, COLS)) != ' ')
            break;
        display_board(board, ROWS, COLS);
        computer_move(board, ROWS, COLS);
        if ((ret = check_win(board, ROWS, COLS)) != ' ')
            break;
        display_board(board, ROWS, COLS);
    }
    ret = check_win(board, ROWS, COLS);
    if (ret == 'X')
    {
        printf("恭喜你！你赢了！\n");
    }
    else if (ret == 'O')
    {
        printf("不好意思！你输了！\n");
    }
    else if (ret == 'q')
    {
        printf("平局！\n");
    }
    display_board(board, ROWS, COLS);


}
void menu()
{
    printf("*******************************\n");
    printf("****** 1. play   0. exit ******\n");
    printf("*******************************\n");

}
int main()
{
    int input = 0;

    do
    {
        menu();
        scanf("%d", &input);
        switch (input)
        {
        case 1:
            game();
            break;
        case 0:
            break;
        default:
            printf("选择错误！！");
            break;

        }

    } while (input);
    return 0;
}