分別建立test.c   game.c 兩個原始檔，以及game.h標頭檔案

  這裡的三子棋遊戲是指棋盤為3*3，玩家與電腦之間的對決，先將各自的棋下為一排（橫/豎/斜）者獲勝，電腦所    下位置是隨機產生

  1. game.h中用於函式定義，如下：

#ifndef __GAME_H__
#define __GMME_H__

#define ROWS 3
#define COLS 3

 void init_board(char board[ROWS][COLS], int rows,int  cols);//初始化棋盤
 void display_board(char board[ROWS][COLS], int rows, int  cols);//列印棋盤
 void player_move(char board[ROWS][COLS], int rows, int  cols);//實現玩家下棋的函式
 void computer_move(char board[ROWS][COLS], int rows, int  cols);//實現電腦下棋的函式
 char check_win(char board[ROWS][COLS], int rows, int  cols);//判斷輸贏的函式

#endif //__GAME_H__
 

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include"game.h"

void menu()  //列印選單
{
	printf("*********  1.PLAY  ********\n");
	printf("*********          ********\n");
	printf("*********  0.EXIT  ********\n");
}
void game()
{
	int ret = 0;
	char board[ROWS][COLS] = { 0 };
	init_board(board, ROWS, COLS);
	display_board(board, ROWS, COLS);
	while (1)
	{
		printf("player move;\n");
		player_move(board, ROWS, COLS);
		display_board(board, ROWS, COLS);
	    ret = check_win(board, ROWS, COLS);
		if (ret != ' ')
			break;
		printf("computer move:\n");
		computer_move(board, ROWS, COLS);
		display_board(board, ROWS, COLS);
		check_win(board, ROWS, COLS);
		if (ret != ' ')
			break;
	}
	if (ret == 'X')  
	{
		printf("Congratulatons! player win!\n");
	}
        else if (ret == '0')
	{
		printf("Undortunately! player lost!\n");
	}
	else
	{
		printf("It's tie,play again?\n");
	}
}
enum  Option
{
	EXIT,//0
	PLAY //1
};
int main()
{
	int input = 0;
	srand((unsigned int)time(NULL));
	do
	{
		menu();
		printf("please chose:>");
		scanf("%d", &input);
		switch(input)
		{
		case PLAY:
			game();
			break;
		case EXIT:
			break;
		default:
			printf("default!please chose again!\n");
			break;
		}
	} while (input);
	system("pause\n");
	return 0;
}
 

#define _CRT_SECURE_NO_WARNINGS 1
#include"game.h"
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>

void init_board(char board[ROWS][COLS], int rows, int  cols)
{
	memset(board, ' ', sizeof(char)*rows*cols);//用來設定記憶體的函式(指定記憶體地址，初始化，記憶體大小）
}
void display_board(char board[ROWS][COLS], int rows, int  cols)
{
	int i = 0;
	for (i = 0; i < rows; i++)
	{
		printf(" %c | %c | %c \n", board[i][0], board[i][1], board[i][2]);
		if (i != rows - 1)
			printf("---|---|---\n");
	}
}
void player_move(char board[ROWS][COLS], int rows, int  cols)
{
	int x = 0;
	int y = 0;
	/*printf("please enter the coordinates:>");
	scanf("%d%d", &x, &y);*/
	/*x--;
	y--;*/
	while (1)
	{
		printf("please enter the coordinates:>");
		scanf("%d%d", &x, &y);
		x--;
		y--;
		if ((x >= 0) && (x <= rows - 1) && (y >= 0) && (y <= cols - 1))
		{
			if (board[x][y] == ' ')
			{
				board[x][y] = 'X';
				break;
			}
			else
			{
				printf("please enter again:>\n");
			}
		}
	}
}
void computer_move(char board[ROWS][COLS], int rows, int  cols)
{
	while (1)
	{
		int x = rand() % 3;
		int y = rand() % 3;
		if (board[x][y] == ' ')
		{
			board[x][y] = '0';
			break;
		}
	}
}
static int is_full(char board[ROWS][COLS], int rows, int  cols)//僅在此檔案內使用
{
	int i = 0;
	int j = 0;
	for (i = 0; i < rows; i++)
	{
		for (j = 0; j < cols; j++)
		{
			if (board[i][j] == ' ')
				return 0;
		}
	}
	return 1;//表示棋盤已滿
}
char check_win(char board[ROWS][COLS], int rows, int  cols)//三行三列和兩個交叉行
{
	int i = 0;
	for (i = 0; i < rows; 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 < cols; 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[2][2] != ' '))
	{
		return board[1][1];
	}
	if (is_full(board, rows, cols))
	{
		return 'q';//棋盤滿了
	}
	return ' ';
}