c++简易贪吃蛇

#include 
#include 
#include 
#include 
#define High 20  // 游戏画面尺寸
#define Width 30
#define x first
#define y second
using namespace std;
int moveDirection; // 小蛇移动方向，上下左右分别用1，2，3，4表示
int dx[]= {0,-1,1,0,0};
int dy[]= {0,0,0,-1,1};
pairfood;
int g[High][Width] = {0}; // 二维数组存储游戏画布中对应的元素
// 0为空格，-1为边框#，-2为食物F，1为蛇头@，大于1的正数为蛇身*
void newfood() {
    int low=2;
    food.x = rand()%(High-1-2*low) + low;
    food.y = rand()%(Width-1-2*low) + low;
    while(g[food.x][food.y]!=0) {
        food.x = rand()%(High-1-2*low) + low;
        food.y = rand()%(Width-1-2*low) + low;
    }
    g[food.x][food.y] = -2;
}
void gotoxy(int x,int y) { //光标移动到(x,y)位置
    HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD pos;
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(handle,pos);
}
 
void moveSnakeByDirection() {
    int i,j,maxx = 0;
    pairoldTail,oldHead,newHead;
//  扫描所有元素，找到正数元素都+1，同时找到蛇头和蛇尾
    for (i=1; i0) {
                if (maxx1)
                printf("*");   //   输出蛇身*
            else if (g[i][j]==-2)
                printf("F");   //   输出食物F
        }
        printf("n");
    }
}
 
void updateWithInput() { // 与用户输入有关的更新
    if (GetAsyncKeyState('A') && moveDirection!=4) {
        moveDirection = 3;   // 位置左移
        moveSnakeByDirection();
    } else if (GetAsyncKeyState('D') && moveDirection!=3) {
        moveDirection = 4;  // 位置右移
        moveSnakeByDirection();
    } else if (GetAsyncKeyState('W') && moveDirection!=2) {
        moveDirection = 1;  // 位置上移
        moveSnakeByDirection();
    } else if (GetAsyncKeyState('S') && moveDirection!=1) {
        moveDirection = 2;   // 位置下移
        moveSnakeByDirection();
    }
}
 
int main() {
    startup();  // 数据初始化
    while (1) { //  游戏循环执行
        show();  // 显示画面
        moveSnakeByDirection();
        updateWithInput();  // 与用户输入有关的更新
    }
    return 0;
}