请用c语言写出五子棋游戏代码。

好的，以下是基于 C 语言的五子棋游戏代码：

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

#define ROWS 15
#define COLS 15

char board[ROWS][COLS]; // 二维数组表示棋盘

void init_board() // 初始化棋盘
{
    int i, j;
    for (i = 0; i < ROWS; i++) {
        for (j = 0; j < COLS; j++) {
            board[i][j] = '+';
        }
    }
}

void print_board() // 打印棋盘
{
    int i, j;
    printf("  ");
    for (i = 0; i < COLS; i++) {
        printf("%2d", i + 1);
    }
    printf("\n");
    for (i = 0; i < ROWS; i++) {
        printf("%2d", i + 1);
        for (j = 0; j < COLS; j++) {
            printf("%2c", board[i][j]);
        }
        printf("\n");
    }
}

int check_win(int row, int col, char ch) // 判断胜负
{
    int i, j, count;
    // 检查横向
    count = 0;
    for (i = col - 4; i <= col; i++) {
        if (i < 0 || i + 4 >= COLS) continue;
        count = 0;
        for (j = i; j <= i + 4; j++) {
            if (board[row][j] == ch) count++;
        }
        if (count == 5) return 1;
    }
    // 检查纵向
    count = 0;
    for (i = row - 4; i <= row; i++) {
        if (i < 0 || i + 4 >= ROWS) continue;
        count = 0;
        for (j = i; j <= i + 4; j++) {
            if (board[j][col] == ch) count++;
        }
        if (count == 5) return 1;
    }
    // 检查左上到右下的斜线
    count = 0;
    for (i = row - 4, j = col - 4; i <= row && j <= col; i++, j++) {
        if (i < 0 || j < 0 || i + 4 >= ROWS || j + 4 >= COLS) continue;
        count = 0;
        for (int k = 0; k < 5; k++) {
            if (board[i + k][j + k] == ch) count++;
        }
        if (count == 5) return 1;
    }
    // 检查左下到右上的斜线
    count = 0;
    for (i = row + 4, j = col - 4; i >= row && j <= col; i--, j++) {
        if (i >= ROWS || j < 0 || i - 4 < 0 || j + 4 >= COLS) continue;
        count = 0;
        for (int k = 0; k < 5; k++) {
            if (board[i - k][j + k] == ch) count++;
        }
        if (count == 5) return 1;
    }
    return 0;
}

int main()
{
    int row, col, turn = 1;
    char ch;
    init_board();
    while (1) {
        print_board();
        ch = (turn % 2 == 1) ? 'X' : 'O';
        printf("Player %c's turn:\n", ch);
        printf("Enter row and col (e.g. 3 4): ");
        scanf("%d %d", &row, &col);
        if (row < 1 || row > ROWS || col < 1 || col > COLS) {
            printf("Invalid input!\n");
            continue;
        }
        if (board[row - 1][col - 1] != '+') {
            printf("This position has been taken!\n");
            continue;
        }
        board[row - 1][col - 1] = ch;
        if (check_win(row - 1, col - 1, ch)) {
            print_board();
            printf("Player %c wins!\n", ch);
            break;
        }
        turn++;
    }
    return 0;
}

这是一个简单的五子棋游戏实现，包括棋盘的初始化、打印、玩家输入、胜负判断等功能。