自定义棋盘大小的N子棋

三子棋代码：

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

//对于数组的长度，最好定义成宏
//方便程序的扩展，改宏定义则可修改数组元素个数
#define ROW 3
#define COL 3

//1.定义二维数组来表示棋盘
char g_chess_board[ROW][COL];

void Init(){
	//初始化棋盘
	for (int row = 0; row < ROW; ++row){
		for (int col = 0; col < COL; ++col){
			g_chess_board[row][col] = ' ';
		}
	}
}

void Print(){
	//打印
	for (int row = 0; row < ROW; row++){
		printf("| %c | %c | %c |\n", g_chess_board[row][0],
			g_chess_board[row][1], g_chess_board[row][2]);
		if (row != ROW - 1){
			printf("|---|---|---|\n");
		}
	}
}

void PlayMove(){
	//玩家落子
	while (1){
		//1.提示玩家输入一个坐标
		printf("请玩家落子（输入坐标row col）：\n");
		//2.读取玩家的输入
		int row = -1;
		int col = -1;
		scanf("%d %d", &row, &col);
		//3.对玩家的输入进行校验
		//4.若输入非法，循环提示用户重新输入
		//   a.校验坐标是否范围合理
		if (row < 0 || row >= ROW || col < 0 || col >= COL){
			printf("输入的坐标非法，请重新输入！\n");
			continue;
		}
		//   b.玩家输入的坐标对应位置是否已经有子
		if (g_chess_board[row][col] != ' '){
			//当前位置已被占用，不可落子
			printf("当前位置已经有子了，请重新输入！\n");
			continue;
		}
		//5.若输入合法，则把对应位置设为'x'
		g_chess_board[row][col] = 'x';
		break;
	}
}

void ComputerMove(){
	//电脑落子
	//1.随机数产生行和列
	//2.若当前位置被占用，则再产生一次
	printf("请电脑落子!\n");
	int row = 0;
	int col = 0;
	while (1){
		row = rand( ) % ROW;   //[0,2]
		col = rand( ) % COL;   //[0,2]
		if (g_chess_board[row][col] == ' '){
			g_chess_board[row][col] = 'o';	
			break;
		}	
	}
}

int IsFull(){
	for (int row = 0; row < ROW; ++row){
		for (int col = 0; col < COL; ++col){
			if (g_chess_board[row][col] == ' '){
				return 0;
			}
		}
	}
	return 1;
}

//x 表示玩家，o 表示电脑
//返回 x 表示玩家胜利，返回 o 则电脑胜利
//返回 q 表示和棋
//返回 空格 则胜负未分
char CheckWinner(){
	//检测游戏是否结束
	//1.先检查所有行是否连在一起
	for (int row = 0; row < ROW; ++row){
		if (g_chess_board[row][0] == g_chess_board[row][1]
			&& g_chess_board[row][0] == g_chess_board[row][2]
			&&g_chess_board[row][0] !=' '){
			return g_chess_board[row][0];
		}
	}
	//2.在检查所有列是否连在一起
	for (int col = 0; col < COL; ++col){
		if (g_chess_board[0][col] == g_chess_board[1][col]
			&& g_chess_board[0][col] == g_chess_board[2][col]
			&& g_chess_board[0][col] !=' '){
			return g_chess_board[0][col];
		}
	}

	//3.检查对角线
	if (g_chess_board[0][0] == g_chess_board[1][1]
		&& g_chess_board[0][0] == g_chess_board[2][2]
		&& g_chess_board[0][0] != ' '){
		return g_chess_board[0][0];
	}
	if (g_chess_board[2][0] == g_chess_board[1][1]
		&& g_chess_board[2][0] == g_chess_board[0][2]
		&& g_chess_board[2][0] != ' '){
		return g_chess_board[2][0];
	}
	//4.检查是否和棋
	if (IsFull()){
		return 'q';
	}
	return ' ';
}

int main(){
	//1.对其盘进行初始化（全是空格）
	char winner = ' ';
	Init();
	while (1){
        //2.打印棋盘
		Print();
	//3.玩家落子，检查游戏是否结束
		PlayMove();
		winner = CheckWinner();
		if (winner != ' '){
			//游戏结束
			break;
		}
	//4.电脑落子，检查游戏是否结束
		ComputerMove();
		winner = CheckWinner();
		if (winner != ' '){
			//游戏结束
			break;
		}
	}
	if (winner == 'x'){
		printf("玩家获胜！\n");
	}
	else if (winner == 'o'){
		printf("电脑获胜\n");
	}
	else if (winner == 'q'){
		printf("和棋\n");
	}
	system("pause");
	return 0;
}

为了使程序具有通用性，现将代码改进。在使用时，只需将下列代码中宏的N改为所想要的数字，即可实现N子棋。

自定义棋盘大小的N子棋代码：

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

#define CHESS_ROW 5
#define CHESS_COL 5
#define ROW 3
#define COL 3

//定义全局变量
char g_chessboard[CHESS_ROW][CHESS_COL];

void Initialize(){
	//初始化棋盘
	int row;
	int col;
	for (row = 0; row < CHESS_ROW; row++){
		for (col = 0; col < CHESS_COL; col++){
			g_chessboard[row][col] = ' ';
		}
	}
}

void Print(){
	//打印棋盘
	int row;
	int col;
	//打印列数
	printf("   ");
	for (col = 0; col < CHESS_COL; col++){
		printf("   %d ", col);
	}
	printf("\n");

	for (row = 0; row < CHESS_ROW; row++){
		//打印行号
		printf("%02d  ", row);
		for (col = 0; col < CHESS_COL; col++){
			printf("| %c  ", g_chessboard[row][col]);
		}
		printf("|\n");
		printf("    ");
		if (row != CHESS_ROW - 1){
			for (col = 0; col < CHESS_COL; col++){
				printf("|----");
			}
			printf("|\n");
		}
	}
}

void Player(){
	//玩家落子
	while (1){
		int row;
		int col;
		printf("\n请输入落子位置（row col）:\n");
		scanf("%d %d", &row, &col);
		if (row >= CHESS_ROW || row<0 || col >= CHESS_COL || col < 0){
			printf("您的输入有误，请重新输入\n");
			continue;
		}
		if (g_chessboard[row][col] != ' '){
			printf("此位置已被占有，请重新输入\n");
			continue;
		}
		g_chessboard[row][col] = 'x';
		break;
	}
}

void Computer(){
	printf("电脑落子：\n");
	int row = 0;
	int col = 0;
	srand(time(0));
	while (1){
		row = rand() % CHESS_ROW;
		col = rand() % CHESS_COL;
		//若位置没有被占用，落子
		if (g_chessboard[row][col] == ' '){
			g_chessboard[row][col] = 'o';
			break;
		}
	}
}

int IsFull(){
	for (int row = 0; row < CHESS_ROW; row++){
		for (int col = 0; col < CHESS_COL; col++){
			if (g_chessboard[row][col] == ' '){
				return 0;
			}
		}
	}
	return 1;
}

char Check(){
	//检查行
	for (int row = 0; row < CHESS_ROW; row++){
		int countp = 0;
		int countc = 0;
		for (int col = 0; col < CHESS_COL; col++){
			if (g_chessboard[row][col] == 'x'){
				countp++;
			}
			else if (g_chessboard[row][col] == 'o'){
				countc++;
			}
			else if (g_chessboard[row][col] == ' '){
				countc = countp=0;
			}
		}
		if (countp == ROW){
			return 'x';
			break;
		}
		else if (countc == ROW){
			return  'o';
			break;
		}
	}
	//检查列
	for (int col = 0; col < CHESS_COL; col++){
		int countp = 0;
		int countc = 0;
		for (int row = 0; row < CHESS_ROW; row++){
			if (g_chessboard[row][col] == 'x'){
				countp++;
			}
			else if (g_chessboard[row][col] == 'o'){
				countc++;
			}
			else if (g_chessboard[row][col] == ' '){
				countc = countp = 0;
			}
		}
		if (countp == COL){
			return  'x';
			break;
		}
		else if (countc == COL){
			return 'o';
			break;
		}
	}
	//检查对角线
	int row = 0;
	int col = 0;
	int countp = 0;
	int countc = 0;
	//左上角开始的对角线
	while (row < CHESS_ROW){
		if (g_chessboard[row][col] == 'x'){
			countp++;
		}
		else if (g_chessboard[row][col] == 'o'){
			countc++;
		}
		else if (g_chessboard[row][col] == ' '){
			countc = countp = 0;
		}
		row++;
		col++;
		if (countp == ROW){
			return 'x';
			break;
		}
		else if (countc == ROW){
			return 'o';
			break;
		}
	}
	//右上角开始的对角线
	countp = 0;
	countc = 0;
	row = 0;
	col = CHESS_COL- 1;
	while (row<CHESS_ROW){
		if (g_chessboard[row][col] == 'x'){
			countp++;
		}
		else if (g_chessboard[row][col] == 'o'){
			countc++;
		}
		else if (g_chessboard[row][col] == ' '){
			countc = countp = 0;
		}
		row++;
		col--;
		if (countp == ROW){
			return 'x';
			break;
		}
		else if (countc == ROW){
			return 'o'; 
			break;
		}
	}

	//检查棋盘是否已满
	if (IsFull()){
		return 'q';
	}
	return ' ';
}

int main(){
	//1.棋盘初始化
	char winner = ' ';
	Initialize();
	while (1){
		//2.打印棋盘
		Print();
		//3.玩家落子，进行检验
		Player();
		winner = Check();
		//游戏结束
		if (winner != ' '){
			Print();
			break;
		}
		//4.电脑落子，进行检验
		Computer();
		winner = Check();
		//游戏结束
		if (winner != ' '){
			Print();
			break;
		}
	}
	//5.判断胜负
	//用 x 代表玩家，o 代表电脑，q代表和棋
	if (winner == 'x'){
		printf("恭喜你获胜！\n");
	}
	else if (winner == 'o'){
		printf("啊哦，电脑获胜！\n");
	}
	else if (winner == 'q'){
		printf("和棋\n");
	}
	system("pause");
	return 0;
}