在用C语言实现三子棋小游戏之前，我们应当了解三子棋的游戏规则：在九宫格棋盘上，哪一方三个棋子连成一线（一行或一列或对角线）即判定哪一方胜利。

以下为源代码：

1.首先打印出菜单。

void menu(){ printf("**********************************\n"); printf("**********************************\n"); printf("***** 0.play *************\n"); printf("***** 1.exit *************\n"); printf("**********************************\n");} menu(); do { printf("请输入要选的的选项: "); scanf("%d",&input); switch (input) { case 0: game(); break; case 1: printf("退出游戏"); break; default: printf("请输入要选的选项:\n"); break; } } while (input);

2.创建一个二维数组board用来储存三子棋的元素，并对其进行初始化。

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] = ' '; } }}

3.打印九宫格棋盘。

void Displayboard(char board[ROW][COL], int row, int col) //打印棋盘{ int i; int j; for (i = 0; i < row; i++) { for (j = 0; j < col ; j++) { printf(" %c ", board[i][j]); if (j == col - 1) continue; printf("|"); } printf("\n"); if (i < row - 1) printf("-----------\n"); }}

4.使用Playermove和Computermove函数来对board数组进行更改，模拟玩家和电脑落子情况。

void Playermove(char board[ROW][COL]) //玩家输入坐标{ while (1) { int x = 0; int y = 0; printf("请玩家输入坐标"); scanf_s("%d %d", &x, &y); if (x <= ROW && x >= 1 && y <= COL && y >= 1) //判断输入的坐标是否越界 { if (board[x - 1][y - 1] == ' ') //输入的坐标必须为空才可以落子 { board[x - 1][y - 1] = '*'; break; } else printf("坐标被占用，请重新输入\n"); } else printf("坐标有误，请重新输入\n"); } } void Computermove(char board[ROW][COL]) //电脑输入坐标{ int x = 0; int y = 0; while (1) { x = rand() % 3; //使用rand函数生成随机数并取余得到电脑落子坐标 y = rand() % 3; if (board[x][y] == ' ') { printf("电脑输入坐标%d %d\n", x+1, y+1); board[x][y] = '#'; break; //打印后跳出循环 } }}

5.玩家和电脑每落一次子，就要进行一次判断是否获胜，根据返回值来进行判断游戏结果。

int Iswin(char board[ROW][COL], int row, int col) //判断谁获胜{ int i; int j; //1为玩家获胜 0为电脑获胜 2为平局 for (i = 0; i < row; i++) { if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][1] == '*') //判断同一行是否相等 return 1; else if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][1] == '#') return 0; } for (j = 0; j < col; j++) { if (board[0][j] == board[1][j] && board[1][j] == board[2][j] && board[1][j] == '*') //判断同一列是否相等 return 1; else if (board[0][j] == board[1][j] && board[1][j] == board[2][j] && board[1][j] == '#') return 0; } if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[1][1] == '*') //判断左对角线是否相等 return 1; else if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[1][1] == '#') return 0; if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[1][1] == '*') //判断右对角线是否相等 return 1; else if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[1][1] == '#') return 0; if (Full(board, ROW, COL)) //判断是否平局 return 2; return 3; //返回3为继续进行游戏}

6.函数声明，宏定义，函数的定义实现，测试。

#include<stdio.h>#include<string.h>#include<time.h>#include<stdlib.h>#include"game.h"# define _CRT_SECURE_NO_WARNINGS#define ROW 3#define COL 3void Initboard(char board[ROW][COL], int row, int col);void Displayboard(char board[ROW][COL], int row, int col);void Playermove(char board[ROW][COL]);void Computer(char board[ROW][COL]);int Iswin(char board[ROW][COL], int row, int col);int Full(char board[ROW][COL], int row, int col);void menu(){ printf("**********************************\n"); printf("**********************************\n"); printf("***** 0.play *************\n"); printf("***** 1.exit *************\n"); printf("**********************************\n");}void game(){ char board[ROW][COL] = { 0 }; int ret; Initboard(board, ROW, COL); //用Initboard函数初始化数组，并用‘ '初始化数组 printf("游戏开始\n"); while (1) { Playermove(board); //玩家输入坐标 Displayboard(board, ROW, COL); ret = Iswin(board, ROW, COL); //判断是否获胜 if (ret == 1) { printf("玩家获胜"); break; } else if (ret == 0) { printf("电脑获胜"); break; } else if (ret == 2) { printf("平局"); break; } printf("\n\n"); Computer(board); //电脑输入坐标 Displayboard(board, ROW, COL); ret = Iswin(board, ROW, COL); //判断是否获胜 if (ret == 1) { printf("玩家获胜"); break; } else if (ret == 0) { printf("电脑获胜"); break; } else if (ret == 2) { printf("平局"); break; } printf("\n\n"); }}int main(){ int input = 0; srand((unsigned int)time(NULL)); menu(); do { printf("请输入要选的的选项: "); scanf("%d",&input); switch (input) { case 0: game(); break; case 1: printf("退出游戏"); break; default: printf("请输入要选的选项:\n"); break; } } while (input);}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) //打印棋盘{ int i; int j; for (i = 0; i < row; i++) { for (j = 0; j < col ; j++) { printf(" %c ", board[i][j]); if (j == col - 1) continue; printf("|"); } printf("\n"); if (i < row - 1) printf("-----------\n"); }}void Playermove(char board[ROW][COL]) //玩家输入坐标{ while (1) { int x = 0; int y = 0; printf("请玩家输入坐标"); scanf_s("%d %d", &x, &y); if (x <= ROW && x >= 1 && y <= COL && y >= 1) { if (board[x - 1][y - 1] == ' ') { board[x - 1][y - 1] = '*'; break; } else printf("坐标被占用，请重新输入\n"); } else printf("坐标有误，请重新输入\n"); }}void Computer(char board[ROW][COL]) //电脑输入坐标{ int x = 0; int y = 0; while (1) { x = rand() % 3; y = rand() % 3; if (board[x][y] == ' ') { printf("电脑输入坐标%d %d\n", x+1, y+1); board[x][y] = '#'; break; //打印后跳出循环 } }}int Iswin(char board[ROW][COL], int row, int col) //判断谁获胜{ int i; int j; //1为玩家获胜 0为电脑获胜 2为平局 for (i = 0; i < row; i++) { if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][1] == '*') //判断同一行是否相等 return 1; else if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][1] == '#') return 0; } for (j = 0; j < col; j++) { if (board[0][j] == board[1][j] && board[1][j] == board[2][j] && board[1][j] == '*') //判断同一列是否相等 return 1; else if (board[0][j] == board[1][j] && board[1][j] == board[2][j] && board[1][j] == '#') return 0; } if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[1][1] == '*') //判断左对角线是否相等 return 1; else if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[1][1] == '#') return 0; if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[1][1] == '*') //判断右对角线是否相等 return 1; else if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[1][1] == '#') return 0; if (Full(board, ROW, COL)) //判断是否平局 return 2; return 3; //返回3为继续进行游戏}int Full(char board[ROW][COL], int row, int col) //判断棋盘是否下满{ int i; int j; for (i = 0; i < row; i++) { for (j = 0; j < col; j++) { if (board[i][j] == ' ') return 0; //此时棋盘未满 } } return 1; //此时棋盘已满}

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