程式執行結果如下：

本次程式碼，實現一個簡易的三子棋遊戲，基本思路是：列印選單——選擇遊戲——列印初始棋盤——玩家下棋——電腦隨機下棋（利用rand（srand）的庫函式）——判斷（棋盤是否的格子是否為空，判斷哪一方贏）——結束遊戲。

程式碼為下：

game.h

#ifndef _GAME__H__
#define _GAME__H__
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>


#define ROWS  3 //行
#define COLS  3//列


void init_board(char board[ROWS][COLS],int row,int col);            //初始化棋盤
void display_board(char board[ROWS][COLS],int row,int col);         //列印棋盤
void player_move(char board[ROWS][COLS], int row, int col);         //玩家移動
void compute_move(char board[ROWS][COLS], int row, int col);        //電腦移動
char check_win(char board[ROWS][COLS], int row, int col);           //判斷輸贏
#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,' ',col*row*sizeof(char));
}


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("請輸入座標: ");
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("座標錯誤，請重新輸入!");
}
}
else
{
printf("座標錯誤，請重新輸入!");
}
}
}
void compute_move(char board[ROWS][COLS], int row, int col)
{
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 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"game.h"


void menu()
{
printf("*********************\n");
printf("****1.play 0.exit****\n");
printf("*********************\n");
}
void game()
{
char board[ROWS][COLS]={ 0 };
int ret = '0';
init_board(board, ROWS, COLS);//初始化棋盤
display_board(board, ROWS, COLS);//列印棋盤
srand((unsigned int)time(NULL));
while (1)
{
player_move(board, ROWS, COLS);
ret = check_win(board, ROWS, COLS);
if (ret != ' ')
break;
display_board(board, ROWS, COLS);
compute_move(board, ROWS, COLS);
if (ret != ' ')
break;
display_board(board, ROWS, COLS);
}
if (ret == 'X')
printf("玩家贏\n");
else if (ret == '0')
printf("電腦贏\n");
else if (ret == 'q')
printf("平局\n");
display_board(board, ROWS, COLS);
}
int main()
{
int input = 0;

do
{
menu();
printf("請選擇: ");;
scanf("%d", &input);
switch (input)
{
case 1:
game();
break;
case 0:
break;
default:
printf("輸入錯誤，請重新輸入\n");
break;
}
} while (input);
return 0;
}