简单的三子棋实现

game.h

#pragma warning(disable: 4996)

#ifndef __GAME_H__ 
#define __GAME_H__

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


#define ROW 3
#define COL 3

void InitBoard(char board[ROW][COL],int row,int col);
void DisplayBoard(char board[ROW][COL],int row,int col);
void PlayMove(char board[ROW][COL], int row, int col);
void ComputerMove(char board[ROW][COL], int row, int col);
char CheckWin(char board[ROW][COL], int row, int col);

enum OPTION
{
	EXIT,
    PLAY
};
#endif  //__GAME_H__

#ifndef 和 #endif 要一起使用，如果丢失#endif，可能会报错

#ifndef起到的效果是防止一个源文件两次包含同一个头文件，而不是防止两个源文件包含同一个头文件

分析:

当第一次包含test.h时，由于没有定义_TEST_H，条件为真，这样就会包含(执行)#ifndef _TEST_H和

#endif之间的代码，当第二次包含test.h时前面一次已经定义了_TEST_H，条件为假，#ifndef _TEST_H和

#endif之间的代码也就不会再次被包含，这样就避免了重定义了.

game.c

#include"game.h"

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

void PlayMove(char board[ROW][COL], int row, int col)
{
	int x = 0;
	int y = 0;
	printf("玩家走：\n");
	while (1)
	{
		printf("请输入坐标： \n");
		scanf("%d%d", &x, &y);
		if(x >= 1 && x <= row && y >= 1 && y <= col)
		{ 
			if (board[x - 1][y - 1] == ' ')
			{
				board[x - 1][y - 1] = 'X';
				break;
			 }
			else
				printf("输入坐标被占用！\n");	
		}
		else
			printf("输入坐标非法！\n");
	}
}

void ComputerMove(char board[ROW][COL], int row, int col)
{
	int x = 0;
	int y = 0;
	printf("电脑走： \n");
	while (1)
	{
		 x = rand() % row;
		 y = rand() % col;
		if (board[x][y] == ' ')
		{
			board[x][y] = 'O';
			break;
		}

	}

}

static int IsFull(char board[ROW][COL],int row,int col)//只能在当前源文件内部使用，外部连接属性变成内部连接属性（命名不冲突）
{
	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 CheckWin(char board[ROW][COL], 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])
		{
			return board[i][0];
		}
	}
	for (i = 0;i < col;i++)
	{
		if (board[0][i] == board[1][i] && board[1][i] == board[2][i])
		{
			return board[0][i];
		}
	}
	if (board[0][0] == board[1][1] && board[1][1] == board[2][2])
	{
		return board[1][1];
	}
	if (board[0][2] == board[1][1] && board[1][1] == board[2][0])
	{
		return board[1][1];
	}
	if (IsFull(board, row, col))
	{
		return 'PJ';
	}
	return ' ';
}

可是通过改变宏ROW.COL快速改变棋盘大小，但是判断输赢的条件随之也要修改

#include"game.h"

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

void game()
{
	char win = 0;
	char board[ROW][COL] = { 0 };
	InitBoard(board,ROW,COL);
	DisplayBoard(board, ROW, COL);

	while (1)
	{
		PlayMove(board, ROW, COL);
		win = CheckWin(board, ROW, COL);
		DisplayBoard(board, ROW, COL);
		if (win != ' ')
			break;

		ComputerMove(board, ROW, COL);
		win = CheckWin(board, ROW, COL);
		DisplayBoard(board, ROW, COL);
		if (win != ' ')
			break;
	}

		 if(win == 'X')
		 {
			 printf("玩家赢！\n");
		 }
		 else if(win == 'O')
		 {
			 printf("电脑赢！\n");
		 }
		 else 
		 {
			 printf("平局！\n");
		 }

}
void test()
{
	int i = 0;
	srand((unsigned int)time(NULL));//初始化随机数种子
	do 
	{
		menu();
		printf("请输入： \n");
		scanf("%d", &i);
		switch(i)
		{
		case PLAY:
			printf("游戏开始\n");
			game();
			break;
		case EXIT:
			printf("游戏结束\n");
			break;
		default:
			printf("选择错误\n");
			break;
		}
	} while (i);
}

int main()
{
	test();
	system("pause");
	return 0;
}

‘X’玩家赢

‘O’电脑赢

‘PJ’平局

‘ ’未分出结果

ps：如果开始游戏时选择1 任意数字

能运行游戏，但是会发生错误~

求大神~~