实现三子棋游戏

1. 首先在game.c中构建一个菜单，供玩家选择，提供两个选项：1.play 0.exit ，简单测试一下能否编译调试。

#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("开始游戏");
}

#define _CRT_SECURE_NO_WARNINGS
#include"game.h"


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

		switch (input)
		{
		case 0:
			break;
		case 1:
			game();
			break;
		default:
			printf("选择有误，请重新选择>:");
			break;

		}

	} while (input);
	printf("退出游戏，游戏结束！");
	system("pause");
	return 0;
}

2. 完善game.h中的函数，并在game.c中实现具体功能。

构建和初始化棋盘、打印棋盘、玩家走、电脑走、判断输赢或是平局等模块。

      #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里填充函数内容

~~~创建棋盘（初始化为空格）

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

~~~打印棋盘

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("请玩家输入坐标>:\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("坐标被占用，重新输入>:\n");
			}
		}
		printf("输入坐标有误，重新输入>:\n");
	}
}

~~~电脑走

void Compurter(char board[ROW][COL], int row, int col)
{
	while (1)
	{
		int x, y;
		x = rand() % row;//产生0-（row-1）的随机数
		y = rand() % col;

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

~~~棋盘是否已满

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

~~~判断输赢

char Iswin(char board[ROW][COL], int row, int col)
{
	for (int i = 0; i < row; i++)//判断行相等
	{
		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++)//判断列相等
	{
		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++)//判断左对角线相等
	{
		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++)//判断右对角线相等
	{
		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;
}

~~~游戏总控制函数

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！你赢了>>\n");
	}
	else if ('0' == ret)
	{
		printf("很遗憾！你输了>>\n");
	}
}

4.这个程序主要实现功能，没有注重游戏质量。比如电脑走是随机的，没有刻意堵棋；没有让玩家自定义棋子形状；菜单选项中没有在玩一次和重新开始的选项；这些都是可以完善的点。

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