分段錯誤：11 c++ 錯誤

Question

這是我第一次在這個論壇上提問，所以就這樣吧。 我正在創建一個用於練習的井字游戲，並且正在使用枚舉器和遞歸，因為我從來沒有真正做過枚舉，並且總是可以進行一些遞歸練習。好吧，無論如何我剛剛完成了為 player2 進行隨機移動的編碼，然后大約 3 圈它給出了分段錯誤，我不知道為什么......我希望你們能弄清楚，謝謝！

#include <iostream>
#include <string>
#include <cstdlib>

const int size = 3;

enum play {none,X,O};

void NPC(play (&board)[size][size],play player2) {
  srand(time(NULL));
  int tempx = rand() % 3;
  int tempy = rand() % 3;
  if(board[tempx][tempy] == none)
    board[tempx][tempy] = player2;
  else
    NPC(board,player2);
}

void getBoardState(play (&board)[size][size],int y,int x) {
  if(board[x][y] == none) std::cout << " ";
  else if(board[x][y] == X) std::cout << "X";
  else std::cout << "O";
}

void printboard(play (&board)[size][size]){
  int length = 4 * size - 1;
  for(int i = 1; i <= length; i++) {
    for(int j = 1; j <= length; j++) {
      if(i % 4 == 0 && j % 4 == 0) std::cout << "+";
      else if(i % 4 == 0) std::cout << "-";
      else if(j % 4 == 0) std::cout << "|";
      else if(i % 2 == 0 && j % 2 == 0) getBoardState(board,(i - 2)/4,(j - 2)/4);
      else std::cout << " ";
    }
    std::cout << std::endl;
  }
}

int main() {
  play player = O, player2 = X;
  bool over = false;
  play board[size][size];
  for(int i = 0; i < size; i++) {
    for(int j = 0; j < size; j++) {
      board[i][j] = none;
    }
  }
  std::string player1 = "";
  std::cout << "What would You like to be? An X or an O?" << std::endl;
  while(((player1 != "X") + (player1 != "O")) == 2) {
    std::cin >> player1;
    if(((player1 != "X") + (player1 != "O")) == 2)
      std::cout << "Invalid entry! Please enter X or an 0!" << std::endl;
    }
  if(player1 == "X") {
    player2 = O;
    player = X;}
  int tempx,tempy;
  while(!over) {
    std::cout << "Please enter an x and then a y (1 to " << size << ")" << std::endl;
    std::cin >> tempx;
    std::cin >> tempy;
    while(tempx > size || tempy > size || board[tempx-1][tempy-1] != none) {
      std::cout << "Invalid entry! Try again!" << std::endl;
      std::cin >> tempx;
      std::cin >> tempy;
    }
    board[tempx-1][tempy-1] = player;
    NPC(board,player2);
    printboard(board);
  }
  return 0;
}

Answer 1

由於每次都調用srand(time(NULL))遞歸中的堆棧空間不足。 隨機數生成器只應在 main 中播種一次，而不應在NPC播種。 time(NULL)返回秒數，因此它很少更改（與遞歸函數調用發生的速度相比），這將消耗所有可用的堆棧空間。