用c语言写一个2048

2048是一款十分经典的数字益智游戏。下面是一个简单的用C语言实现的2048游戏的示例代码：

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

#define ROW 4
#define COL 4

int board[ROW][COL];

void init_board() {
    int i, j;
    srand((unsigned int)time(NULL));
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            board[i][j] = 0;
        }
    }
    int r1 = rand() % ROW;
    int c1 = rand() % COL;
    int r2, c2;
    do {
        r2 = rand() % ROW;
        c2 = rand() % COL;
    } while (r1 == r2 && c1 == c2);
    board[r1][c1] = 2;
    board[r2][c2] = 2;
}

void show_board() {
    int i, j;
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            printf("%4d", board[i][j]);
        }
        printf("\n");
    }
}

void add_random() {
    int i, j;
    int r, c;
    do {
        r = rand() % ROW;
        c = rand() % COL;
    } while (board[r][c] != 0);
    board[r][c] = 2;
}

int is_full() {
    int i, j;
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            if (board[i][j] == 0) {
                return 0;
            }
        }
    }
    return 1;
}

int is_gameover() {
    int i, j;
    if (!is_full()) {
        return 0;
    }
    for (i = 0; i < ROW; i++) {
        for (j = 0; j < COL; j++) {
            if ((i < ROW - 1 && board[i][j] == board[i + 1][j]) ||
                (j < COL - 1 && board[i][j] == board[i][j + 1])) {
                return 0;
            }
        }
    }
    return 1;
}

void shift_left() {
    int i, j, k;
    for (i = 0; i < ROW; i++) {
        k = 0;
        for (j = 1; j < COL; j++) {
            if (board[i][j] != 0) {
                if (board[i][j] == board[i][k]) {
                    board[i][k] *= 2;
                    board[i][j] = 0;
                } else if (board[i][k] == 0) {
                    board[i][k] = board[i][j];
                    board[i][j] = 0;
                } else {
                    k++;
                    board[i][k] = board[i][j];
                    if (k != j) {
                        board[i][j] = 0;
                    }
                }
            }
        }
    }
}

void shift_right() {
    int i, j, k;
    for (i = 0; i < ROW; i++) {
        k = COL - 1;
        for (j = COL - 2; j >= 0; j--) {
            if (board[i][j] != 0) {
                if (board[i][j] == board[i][k]) {
                    board[i][k] *= 2;
                    board[i][j] = 0;
                } else if (board[i][k] == 0) {
                    board[i][k] = board[i][j];
                    board[i][j] = 0;
                } else {
                    k--;
                    board[i][k] = board[i][j];
                    if (k != j) {
                        board[i][j] = 0;
                    }
                }
            }
        }
    }
}

void shift_up() {
    int i, j, k;
    for (j = 0; j < COL; j++) {
        k = 0;
        for (i = 1; i < ROW; i++) {
            if (board[i][j] != 0) {
                if (board[i][j] == board[k][j]) {
                    board[k][j] *= 2;
                    board[i][j] = 0;
                } else if (board[k][j] == 0) {
                    board[k][j] = board[i][j];
                    board[i][j] = 0;
                } else {
                    k++;
                    board[k][j] = board[i][j];
                    if (k != i) {
                        board[i][j] = 0;
                    }
                }
            }
        }
    }
}

void shift_down() {
    int i, j, k;
    for (j = 0; j < COL; j++) {
        k = ROW - 1;
        for (i = ROW - 2; i >= 0; i--) {
            if (board[i][j] != 0) {
                if (board[i][j] == board[k][j]) {
                    board[k][j] *= 2;
                    board[i][j] = 0;
                } else if (board[k][j] == 0) {
                    board[k][j] = board[i][j];
                    board[i][j] = 0;
                } else {
                    k--;
                    board[k][j] = board[i][j];
                    if (k != i) {
                        board[i][j] = 0;
                    }
                }
            }
        }
    }
}

int main() {
    char ch;
    init_board();
    while (1) {
        show_board();
        if (is_gameover()) {
            printf("游戏结束！\n");
            break;
        }
        printf("请输入操作：");
        ch = getchar();
        while (ch == '\n') {
            ch = getchar();
        }
        switch (ch) {
        case 'a':
            shift_left();
            break;
        case 'd':
            shift_right();
            break;
        case 'w':
            shift_up();
            break;
        case 's':
            shift_down();
            break;
        case 'q':
            exit(0);
        default:
            printf("无效操作，请重新输入：");
            continue;
        }
        if (!is_full()) {
            add_random();
        }
    }
    return 0;
}

这个程序中，我们通过 `init_board()` 函数生成一个随机的初始盘面，并通过 `show_board()` 函数将其显示在命令行窗口中。然后我们通过 `add_random()` 函数实现在空白位置上随机添加数字2，通过 `is_full()` 函数判断盘面是否已满，通过 `is_gameover()` 函数判断游戏是否结束。最后，我们通过 `shift_left()`、`shift_right()`、`shift_up()`、`shift_down()` 函数实现盘面的移动，让玩家可以通过输入操作来控制移动方向。