2048小游戏

熟悉的2048小游戏，环境：Windows10及以上，dev.c++5.11及以上或控制台（可能有警告，不影响运行）

付代码：

#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

const int SIZE = 4;
int board[SIZE][SIZE];

// 初始化游戏棋盘，随机两个位置生成 2 或 4
void initialize() {
    for (int i = 0; i < SIZE; ++i) {
        for (int j = 0; j < SIZE; ++j) {
            board[i][j] = 0;
        }
    }
    srand(time(0));
    int x1 = rand() % SIZE;
    int y1 = rand() % SIZE;
    board[x1][y1] = (rand() % 2 == 0) ? 2 : 4;
    int x2, y2;
    do {
        x2 = rand() % SIZE;
        y2 = rand() % SIZE;
    } while (x2 == x1 && y2 == y1);
    board[x2][y2] = (rand() % 2 == 0) ? 2 : 4;
}

// 打印游戏棋盘
void printBoard() {
    system("cls");
    for (int i = 0; i < SIZE; ++i) {
        for (int j = 0; j < SIZE; ++j) {
            if (board[i][j] == 0) {
                cout << ".\t";
            } else {
                cout << board[i][j] << "\t";
            }
        }
        cout << endl;
    }
}

// 在空白位置随机生成一个 2 或 4
void generateRandomTile() {
    int emptyTiles = 0;
    for (int i = 0; i < SIZE; ++i) {
        for (int j = 0; j < SIZE; ++j) {
            if (board[i][j] == 0) {
                emptyTiles++;
            }
        }
    }
    if (emptyTiles > 0) {
        int randomTile = rand() % emptyTiles;
        int count = 0;
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                if (board[i][j] == 0) {
                    if (count == randomTile) {
                        board[i][j] = (rand() % 2 == 0) ? 2 : 4;
                        return;
                    }
                    count++;
                }
            }
        }
    }
}

// 判断是否还有空白位置
bool hasEmptyTile() {
    for (int i = 0; i < SIZE; ++i) {
        for (int j = 0; j < SIZE; ++j) {
            if (board[i][j] == 0) {
                return true;
            }
        }
    }
    return false;
}

// 判断是否还有可合并的相邻方块
bool canMerge() {
    for (int i = 0; i < SIZE; ++i) {
        for (int j = 0; j < SIZE; ++j) {
            if (i > 0 && board[i][j] == board[i - 1][j]) {
                return true;
            }
            if (i < SIZE - 1 && board[i][j] == board[i + 1][j]) {
                return true;
            }
            if (j > 0 && board[i][j] == board[i][j - 1]) {
                return true;
            }
            if (j < SIZE - 1 && board[i][j] == board[i][j + 1]) {
                return true;
            }
        }
    }
    return false;
}

// 判断游戏是否结束
bool isGameOver() {
    return!hasEmptyTile() &&!canMerge();
}

// 向上移动
void up() {
    bool moved = false;
    for (int j = 0; j < SIZE; ++j) {
        for (int i = 1; i < SIZE; ++i) {
            if (board[i][j] != 0) {
                int k = i;
                while (k > 0 && board[k - 1][j] == 0) {
                    board[k - 1][j] = board[k][j];
                    board[k][j] = 0;
                    k--;
                    moved = true;
                }
                if (k > 0 && board[k - 1][j] == board[k][j]) {
                    board[k - 1][j] *= 2;
                    board[k][j] = 0;
                    moved = true;
                }
            }
        }
    }
    if (moved) {
        generateRandomTile();
    }
}

// 向下移动
void down() {
    bool moved = false;
    for (int j = 0; j < SIZE; ++j) {
        for (int i = SIZE - 2; i >= 0; --i) {
            if (board[i][j] != 0) {
                int k = i;
                while (k < SIZE - 1 && board[k + 1][j] == 0) {
                    board[k + 1][j] = board[k][j];
                    board[k][j] = 0;
                    k++;
                    moved = true;
                }
                if (k < SIZE - 1 && board[k + 1][j] == board[k][j]) {
                    board[k + 1][j] *= 2;
                    board[k][j] = 0;
                    moved = true;
                }
            }
        }
    }
    if (moved) {
        generateRandomTile();
    }
}

// 向左移动
void left() {
    bool moved = false;
    for (int i = 0; i < SIZE; ++i) {
        for (int j = 1; j < SIZE; ++j) {
            if (board[i][j] != 0) {
                int k = j;
                while (k > 0 && board[i][k - 1] == 0) {
                    board[i][k - 1] = board[i][k];
                    board[i][k] = 0;
                    k--;
                    moved = true;
                }
                if (k > 0 && board[i][k - 1] == board[i][k]) {
                    board[i][k - 1] *= 2;
                    board[i][k] = 0;
                    moved = true;
                }
            }
        }
    }
    if (moved) {
        generateRandomTile();
    }
}

// 向右移动
void right() {
    bool moved = false;
    for (int i = 0; i < SIZE; ++i) {
        for (int j = SIZE - 2; j >= 0; --j) {
            if (board[i][j] != 0) {
                int k = j;
                while (k < SIZE - 1 && board[i][k + 1] == 0) {
                    board[i][k + 1] = board[i][k];
                    board[i][k] = 0;
                    k++;
                    moved = true;
                }
                if (k < SIZE - 1 && board[i][k + 1] == board[i][k]) {
                    board[i][k + 1] *= 2;
                    board[i][k] = 0;
                    moved = true;
                }
            }
        }
    }
    if (moved) {
        generateRandomTile();
    }
}

int main() {
    initialize();
    while (true) {
        printBoard();
        if (isGameOver()) {
            cout << "Game Over!" << endl;
            break;
        }
        char input;
        cin >> input;
        switch (input) {
            case 'w':
                up();
                break;
            case 's':
                down();
                break;
            case 'a':
                left();
                break;
            case 'd':
                right();
                break;
            default:
                cout << "请输入'w', 's', 'a',d'" << endl;
        }
    }
    return 0;
}