C语言五子棋人机对战

以下是C语言五子棋人机对战的代码实现，其中包括了人机对战的基本逻辑和算法：

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

#define MAX_ROW 15
#define MAX_COL 15
#define CHESSBOARD_SIZE (MAX_ROW * MAX_COL)

#define PLAYER_CHESS 'X'
#define AI_CHESS 'O'
#define EMPTY_CHESS ' '

#define PLAYER_WIN 1
#define AI_WIN 2
#define DRAW 3
#define CONTINUE 4

char chessboard[MAX_ROW][MAX_COL];

void init_chessboard() {
    for (int i = 0; i < MAX_ROW; i++) {
        for (int j = 0; j < MAX_COL; j++) {
            chessboard[i][j] = EMPTY_CHESS;
        }
    }
}

void print_chessboard() {
    printf(" ");
    for (int i = 0; i < MAX_COL; i++) {
        printf(" %d", i + 1);
    }
    printf("\n");
    for (int i = 0; i < MAX_ROW; i++) {
        printf("%c", 'A' + i);
        for (int j = 0; j < MAX_COL; j++) {
            printf(" %c", chessboard[i][j]);
        }
        printf("\n");
    }
}

int check_win(char chess) {
    // 检查行
    for (int i = 0; i < MAX_ROW; i++) {
        for (int j = 0; j <= MAX_COL - 5; j++) {
            if (chessboard[i][j] == chess && chessboard[i][j+1] == chess && chessboard[i][j+2] == chess && chessboard[i][j+3] == chess && chessboard[i][j+4] == chess) {
                return chess == PLAYER_CHESS ? PLAYER_WIN : AI_WIN;
            }
        }
    }
    // 检查列
    for (int i = 0; i <= MAX_ROW - 5; i++) {
        for (int j = 0; j < MAX_COL; j++) {
            if (chessboard[i][j] == chess && chessboard[i+1][j] == chess && chessboard[i+2][j] == chess && chessboard[i+3][j] == chess && chessboard[i+4][j] == chess) {
                return chess == PLAYER_CHESS ? PLAYER_WIN : AI_WIN;
            }
        }
    }
    // 检查正对角线
    for (int i = 0; i <= MAX_ROW - 5; i++) {
        for (int j = 0; j <= MAX_COL - 5; j++) {
            if (chessboard[i][j] == chess && chessboard[i+1][j+1] == chess && chessboard[i+2][j+2] == chess && chessboard[i+3][j+3] == chess && chessboard[i+4][j+4] == chess) {
                return chess == PLAYER_CHESS ? PLAYER_WIN : AI_WIN;
            }
        }
    }
    // 检查反对角线
    for (int i = 0; i <= MAX_ROW - 5; i++) {
        for (int j = 4; j < MAX_COL; j++) {
            if (chessboard[i][j] == chess && chessboard[i+1][j-1] == chess && chessboard[i+2][j-2] == chess && chessboard[i+3][j-3] == chess && chessboard[i+4][j-4] == chess) {
                return chess == PLAYER_CHESS ? PLAYER_WIN : AI_WIN;
            }
        }
    }
    // 检查平局
    int count = 0;
    for (int i = 0; i < MAX_ROW; i++) {
        for (int j = 0; j < MAX_COL; j++) {
            if (chessboard[i][j] != EMPTY_CHESS) {
                count++;
            }
        }
    }
    if (count == CHESSBOARD_SIZE) {
        return DRAW;
    }
    // 游戏继续
    return CONTINUE;
}

int player_move() {
    char row, col;
    printf("请输入您要下棋的位置（例如：A1）：");
    scanf(" %c%c", &row, &col);
    int i = row - 'A';
    int j = col - '1';
    if (i < 0 || i >= MAX_ROW || j < 0 || j >= MAX_COL || chessboard[i][j] != EMPTY_CHESS) {
        printf("您输入的位置不合法，请重新输入！\n");
        return player_move();
    }
    chessboard[i][j] = PLAYER_CHESS;
    return check_win(PLAYER_CHESS);
}

int ai_move() {
    int max_score = 0;
    int max_i = 0, max_j = 0;
    for (int i = 0; i < MAX_ROW; i++) {
        for (int j = 0; j < MAX_COL; j++) {
            if (chessboard[i][j] == EMPTY_CHESS) {
                int score = 0;
                // 检查行
                for (int k = 0; k <= 4; k++) {
                    if (j + k < MAX_COL && chessboard[i][j+k] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                for (int k = 1; k <= 4; k++) {
                    if (j - k >= 0 && chessboard[i][j-k] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                if (score > max_score) {
                    max_score = score;
                    max_i = i;
                    max_j = j;
                }
                // 检查列
                score = 0;
                for (int k = 0; k <= 4; k++) {
                    if (i + k < MAX_ROW && chessboard[i+k][j] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                for (int k = 1; k <= 4; k++) {
                    if (i - k >= 0 && chessboard[i-k][j] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                if (score > max_score) {
                    max_score = score;
                    max_i = i;
                    max_j = j;
                }
                // 检查正对角线
                score = 0;
                for (int k = 0; k <= 4; k++) {
                    if (i + k < MAX_ROW && j + k < MAX_COL && chessboard[i+k][j+k] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                for (int k = 1; k <= 4; k++) {
                    if (i - k >= 0 && j - k >= 0 && chessboard[i-k][j-k] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                if (score > max_score) {
                    max_score = score;
                    max_i = i;
                    max_j = j;
                }
                // 检查反对角线
                score = 0;
                for (int k = 0; k <= 4; k++) {
                    if (i + k < MAX_ROW && j - k >= 0 && chessboard[i+k][j-k] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                for (int k = 1; k <= 4; k++) {
                    if (i - k >= 0 && j + k < MAX_COL && chessboard[i-k][j+k] == AI_CHESS) {
                        score++;
                    } else {
                        break;
                    }
                }
                if (score > max_score) {
                    max_score = score;
                    max_i = i;
                    max_j = j;
                }
            }
        }
    }
    chessboard[max_i][max_j] = AI_CHESS;
    return check_win(AI_CHESS);
}

int main() {
    srand(time(NULL));
    init_chessboard();
    print_chessboard();
    int turn = rand() % 2;
    while (1) {
        if (turn == 0) {
            printf("轮到您下棋了！\n");
            int result = player_move();
            print_chessboard();
            if (result == PLAYER_WIN) {
                printf("恭喜您获胜了！\n");
                break;
            } else if (result == DRAW) {
                printf("平局！\n");
                break;
            }
            turn = 1;
        } else {
            printf("轮到电脑下棋了！\n");
            int result = ai_move();
            print_chessboard();
            if (result == AI_WIN) {
                printf("很遗憾，您输了！\n");
                break;
            } else if (result == DRAW) {
                printf("平局！\n");
                break;
            }
            turn = 0;
        }
    }
    return 0;
}