谁能解释一下在C语言中制定连接4游戏规则的方法？

#include <stdio.h>

#define ROWS 6
#define COLS 7

// 初始化游戏棋盘
void initBoard(char board[ROWS][COLS]) {
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            board[i][j] = ' ';
        }
    }
}

// 打印游戏棋盘
void printBoard(char board[ROWS][COLS]) {
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            printf("| %c ", board[i][j]);
        }
        printf("|\n");
    }
    printf("-----------------------------\n");
}

// 判断某一方是否获胜
int checkWin(char board[ROWS][COLS], char player) {
    // 检查水平方向
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS - 3; j++) {
            if (board[i][j] == player && board[i][j+1] == player && board[i][j+2] == player && board[i][j+3] == player) {
                return 1;
            }
        }
    }
    
    // 检查垂直方向
    for (int i = 0; i < ROWS - 3; i++) {
        for (int j = 0; j < COLS; j++) {
            if (board[i][j] == player && board[i+1][j] == player && board[i+2][j] == player && board[i+3][j] == player) {
                return 1;
            }
        }
    }
    
    // 检查对角线方向（左上到右下）
    for (int i = 0; i < ROWS - 3; i++) {
        for (int j = 0; j < COLS - 3; j++) {
            if (board[i][j] == player && board[i+1][j+1] == player && board[i+2][j+2] == player && board[i+3][j+3] == player) {
                return 1;
            }
        }
    }
    
    // 检查对角线方向（右上到左下）
    for (int i = 0; i < ROWS - 3; i++) {
        for (int j = 3; j < COLS; j++) {
            if (board[i][j] == player && board[i+1][j-1] == player && board[i+2][j-2] == player && board[i+3][j-3] == player) {
                return 1;
            }
        }
    }
    
    return 0;
}

int main() {
    char board[ROWS][COLS];
    char currentPlayer = 'X';
    int column;
    
    initBoard(board);
    
    while (1) {
        printBoard(board);
        
        printf("Player %c's turn. Enter column number (0-6): ", currentPlayer);
        scanf("%d", &column);
        
        // 检查输入的列是否合法
        if (column < 0 || column >= COLS) {
            printf("Invalid column number. Please try again.\n");
            continue;
        }
        
        // 检查选择的列是否已满
        if (board[0][column] != ' ') {
            printf("Column is full. Please try again.\n");
            continue;
        }
        
        // 在选择的列中找到可以放置棋子的位置
        int row;
        for (row = ROWS - 1; row >= 0; row--) {
            if (board[row][column] == ' ') {
                break;
            }
        }
        
        // 在找到的位置放置当前玩家的棋子
        board[row][column] = currentPlayer;
        
        // 检查当前玩家是否获胜
        if (checkWin(board, currentPlayer)) {
            printBoard(board);
            printf("Player %c wins!\n", currentPlayer);
            break;
        }
        
        // 切换到另一个玩家
        currentPlayer = (currentPlayer == 'X') ? 'O' : 'X';
    }
    
    return 0;
}