我用C++编写了一个简单的兰顿蚂蚁控制台程序。但是（我不知道为什么）每次运行程序时都会出现核心转储错误：

#include <iostream>#include <ctime>#include <cstdlib>using namespace std;int main(){    srand(time(NULL));    bool endGame = false;    enum compass {north, east, south, west};    compass dir = north;    int x = 0, y = 0;    int n = 30, m = 30;    int **board = new int*[n];    for(int i = 0; i <n; i++)        board[i] = new int[m];    for(int i=0; i<n; i++)        for(int j=0; j<m; j++)            board[i][j] = rand()%2;    long count = 0;    while(!endGame)    {        for(int i = 0; i < n; i++)        {            for(int j = 0; j < m; j++)            {                //Print board                if(board[i][j] == 0)                    cout << '+';                else                    cout << '#';            }            cout << endl;        }        //Ant        if (board[x][y] == 0)        {            board[x][y] = 1;            switch (dir){            case north:                dir = east;                x = ((x+1)%m);                break;            case east:                dir = south;                y = ((y-1) % n);                break;            case south:                dir = west;                x = ((x-1) % m);                break;            case west:                dir = north;                y = ((y+1) %n);                break;            }        }else        {            board[x][y] = 0;            switch(dir){            case north:                dir = west;                x = ((x-1) % m);                break;            case west:                dir = south;                y = ((y-1) % n);                break;            case south:                dir = east;                x = ((x+1)%m);                break;            case east:                dir = north;                y = ((y+1) %n);                break;            }        }        cout << endl << count << endl;        count++;        cin.sync();        cin.get();    }    cin.sync();    cin.get();    return 0;}

如何解决这个错误？

回答：

可能是这样使用取模运算导致的：

x = ((x-1) % m);

请注意负数 % 正数 = 负数，这意味着你可能会超出边界。