1. 首先在game.c中構建一個選單，供玩家選擇，提供兩個選項：1.play 0.exit ，簡單測試一下能否編譯除錯。

#define _CRT_SECURE_NO_WARNINGS
#include"game.h"


void menu()
  {
	printf("############################\n");
	printf("#######    1. paly   #######\n");
	printf("#######    0. exit   #######\n");
	printf("############################\n");
	}

void game()
{
	printf("開始遊戲");
}
 

#define _CRT_SECURE_NO_WARNINGS
#include"game.h"


int main()
{
	int input = 0;
	 menu();
	
	do 
	{
		printf("請選擇>:");
		scanf("%d", &input);

		switch (input)
		{
		case 0:
			break;
		case 1:
			game();
			break;
		default:
			printf("選擇有誤，請重新選擇>:");
			break;

		}

	} while (input);
	printf("退出遊戲，遊戲結束！");
	system("pause");
	return 0;
}
 

2. 完善game.h中的函式，並在game.c中實現具體功能。

構建和初始化棋盤、列印棋盤、玩家走、電腦走、判斷輸贏或是平局等模組。

      #pragma once
#ifndef __GAME_H__
#define _GAME_H_

#define ROW 3  
#define COL 3

#include <stdio.h>
#include<stdlib.h>
#include<string.h>

void menu();
void game();
void Create_board(char board[ROW][COL], int roW,int col);
void Print_board(char board[ROW][COL], int row, int col);
void Player(char board[ROW][COL], int row, int col);
void Compurter(char board[ROW][COL], int row, int col);
char Iswin(char board[ROW][COL], int row, int col);
int Full(char board[ROW][COL], int row, int col);

#endif
 

3. 在game.c裡填充函式內容

~~~建立棋盤（初始化為空格）

void Create_board(char board[ROW][COL], int row, int col)
{
	memset(&board,' ',row*col*sizeof(board[0][0]));//把陣列全部初始化成空格
}

~~~列印棋盤

void Print_board(char board[ROW][COL], int row, int col)
{
		for (int i = 0; i<row; i++)
		{
			for (int j = 0; j<col; j++)
			{
				printf(" %c ", board[i][j]);
				if (j<row - 1)
				{
					printf("|");
				}
			}
			printf("\n");
			if (i<row - 1)
			{
				for (int j = 0; j<col; j++)
				{
					printf("---");
					if (j<row - 1)
					{
						printf("|");
					}
				}
				printf("\n");
			}
		}
}

~~~玩家走

void Player(char board[ROW][COL], int row, int col)
{
	while (1)
	{
		int x, y;
		printf("請玩家輸入座標>:\n");
		scanf("%d %d", &x, &y);
		if ((x > 0 && x <row) || y > 0 && y <col)
		{
			if (board[x][y] != ' ')
			{
				board[x][y] = 'X';
				break;
			}
			else
			{
				printf("座標被佔用，重新輸入>:\n");
			}
		}
		printf("輸入座標有誤，重新輸入>:\n");
	}
}

~~~電腦走

void Compurter(char board[ROW][COL], int row, int col)
{
	while (1)
	{
		int x, y;
		x = rand() % row;//產生0-（row-1）的隨機數
		y = rand() % col;

		if (board[x][y] != ' ')
		{
			board[x][y] = '0';
			break;
		}
	}
}

~~~棋盤是否已滿

int Full(char board[ROW][COL], int row, int col)//1表示滿
{
	for (int i = 0; i<row; i++)
	{
		for (int j = 0; j<col; j++)
		{
			if (board[i][j] == ' ')
			{
				return 0; 
			}
		}
	}
	return 1;
}

~~~判斷輸贏

char Iswin(char board[ROW][COL], int row, int col)
{
	for (int i = 0; i < row; i++)//判斷行相等
	{
		if (board[i][0] == board[i][1] && board[i][0] == board[i][2])
		{
			return board[i][0];
			break;
		}
	}
	for (int i = 0; i<col; i++)//判斷列相等
	{
		if (board[0][i] == board[1][i] && board[1][i] == board[2][i] && board[1][i] != ' ')
		{
			return board[1][i];
		}
	}
	
	for (int i = 1; i < col; i++)//判斷左對角線相等
	{
		static int count = 0;
		if (board[0][0] == board[i][i])
		{
			count++;
		}
		if (count == col - 1)
		{
			return board[0][0];
		}
	}
	for (int i = 0; i <row; i++)//判斷右對角線相等
	{
		for (int j = col-1; j >=0; j--)
		{
			static int count = 0;
			if (board[0][col-1] == board[i][j])
			{
				count++;
			}
			if (count == col - 1)
			{
				return board[0][col - 1];
			}
		}
	}
	if (Full(board, ROW, COL))//平局
	{
		return -1;
	}
	return -2;
}

~~~遊戲總控制函式

void game()
{
	srand((unsigned int)time(0));
	char board[ROW][COL] = {0};
	Create_board(board[ROW][COL], ROW, COL );
	Print_board(board[ROW][COL], ROW, COL);
	char ret;

	while (1)
	{
		Player(board[ROW][COL], ROW, COL);
		Print_board(board[ROW][COL], ROW, COL);
		ret =  Iswin(board[ROW][COL], ROW, COL);
		if ('-2' != ret)
		{
			break; 
		}

		compurter(board[ROW][COL], ROW ,COL);
		print_board(board[ROW][COL], ROW ,COL);
		ret = Iswin(board[ROW][COL], ROW, COL);
		if ('-2' != ret)
		{
			 break;
		}
	}
	if (ret == '-1')
	{
		printf("平局！");
	}
	else if ('X' == ret)
	{
		printf("恭喜你！你贏了>>\n");
	}
	else if ('0' == ret)
	{
		printf("很遺憾！你輸了>>\n");
	}
}

4.這個程式主要實現功能，沒有注重遊戲質量。比如電腦走是隨機的，沒有刻意堵棋；沒有讓玩家自定義棋子形狀；選單選項中沒有在玩一次和重新開始的選項；這些都是可以完善的點。