c - 初级 C 程序 - 段错误(核心转储)

Question

程序编译得很好，但我不断收到以下输出:

Segmentation fault (code dumped)

该程序旨在与人和计算机一起玩一个简单的井字游戏，并在随机空间中进行游戏。我很好奇这条消息的含义，并觉得它与我的指针有关，但我不确定如何或在哪里。非常感谢任何帮助。这是我的代码:

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

// Initializing board
void clear_table(char board [3][3])
{
int i, j;

//Outer loop for rows
for(i=0; i<3; i++)
{
    //Inner loop for columns
    for(j=0; j<3; j++)
    {
       board[i][j] = ' ';
    }
  }
}

// prints the board in nice format
void display_table (char board [3][3])
{
int i, j;

printf("\n\n The board is: \n");

//Outer loop for rows
for(i=0; i<3; i++)
{
    //Inner loop for columns
    for(j=0; j<3; j++)
    {
        //Printing character
        printf(" %c", board[i][j]);
    }

    printf(" ");

    //Printing footer
    printf("\n _ _ _ \n");
 }
}

//Validates the move
int check_legal_option(char board[3][3], int row, int col)
{
//Checking position
if(board[row][col] == ' ')
{
   //Available
   return 1;
}

return 0;
}

//Function that generates a valid move for player 2
void generate_player2_move(char board[3][3], int *row, int *col)
{
//Validating move
while(1)
{
    //Generating computer position
    *row = rand() % 3;
    *col = rand() % 3;

    //Checking for empty position
    if(check_legal_option(board, *row, *col) == 1)
        break;
  }
}

//Function that checks whether board is full or not
int check_table_full(char board[3][3])
{
int i, j;

//Outer loop for rows
for(i=0; i<3; i++)
{
    //Inner loop for columns
    for(j=0; j<3; j++)
    {
        //Board is not Full
       if(board[i][j] == ' ')
            return 0;
    }
}

//Board Full
return 1;
}

// win returns true if the given player has won on the
// given board, else it returns false
int win (char board [3][3], char player)
{
return (board[0][0] == player && board[0][1] == player && board[0][2] == player) ||
       (board[1][0] == player && board[1][1] == player && board[1][2] == player) ||
       (board[2][0] == player && board[2][1] == player && board[2][2] == player) ||
       (board[0][0] == player && board[1][0] == player && board[2][0] == player) ||
       (board[0][1] == player && board[1][1] == player && board[2][1] == player) ||
       (board[0][2] == player && board[1][2] == player && board[2][2] == player) ||
       (board[0][0] == player && board[1][1] == player && board[2][2] == player) ||
       (board[0][2] == player && board[1][1] == player && board[2][0] == player);

}

//Function that checks for winner
int check_three_in_a_row(char board[3][3], char player1, char player2)
{
//Checking for winning of player
if(win(board, 'X') == 1 && win(board, 'O') == 1)
{
    return 2;
}
//Checking for winning of player 1
else if(win(board, 'O') == 1)
{
    return 0;
}
//Checking for winning of player 2
else if(win(board, 'X') == 1)
{
    return 1;
}
//Tie
else
{
    return -1;
}
}

//Function that plays the game
void playGame(char board[3][3], char player1, char player2)
{
int row, col;
int winner;

//Loop till board is full
while(check_table_full(board) != 1)
{
    //Player turn
    while(1)
    {
        //Reading positions from user
        printf("\n Player 1 enter your selection [row,col]: ");
        scanf("%d %d", &row, &col);

        //Making suitable for array indexing
        row = row - 1;
        col = col - 1;

        //Checking for empty position
        if(check_legal_option(board, row, col) == 1)
           break;
       else
           printf("\n Invalid choice... Try again!! \n ");
    }

    //Storing in array
    board[row][col] = player1;

    //Printing board
    display_table(board);

    //Finding winner
    winner = check_three_in_a_row(board, player1, player2);

    //If either of winner is found
    if(winner >= 0 && winner <= 2)
    {
        //Printing winner
        switch(winner)
        {
            //Displaying winner
            case 0: printf("\n Player 1 won the game... \n"); break;
            case 1: printf("\n Player 2 won the game... \n"); break;
            case 2: printf("\n Game Tie ... \n"); break;
        }

        return;
    }

    //Generating a move
    generate_player2_move(board, &row, &col);

    //Storing in array
    board[row][col] = player2;

    printf("\n Player 2 has entered [row,col]: %d,%d \n", row+1, col+1);

    //Printing board
    display_table(board);

    //Finding winner
    winner = check_three_in_a_row(board, player1, player2);

    //If either of winner is found
    if(winner >= 0 && winner <= 2)
    {
        //Printing winner
        switch(winner)
        {
            //Displaying winner
            case 0: printf("\n Player 1 won the game... \n"); break;
            case 1: printf("\n Player 2 won the game... \n"); break;
            case 2: printf("\n Game Tie ... \n"); break;
        }

        return;
    }
  }
}

//Main function
int main()
{
//Board
char board[3][3];

//Player characters
char player1Character='O', player2Character='X';

//Initializing random function
srand(time(NULL));

//Initializing board
clear_table(board);

//Printing board
display_table(board);

//Playing game
playGame(board, player1Character, player2Character);

return 0;
}

Answer 1

问题就在这里，在 PlayGame 函数的开始处:

//Reading positions from user
printf("\n Player 1 enter your selection [row,col]: ");
scanf("%d %d", &row, &col);

提示似乎建议您输入两个以逗号分隔的数字，例如 2,2 以获得中心位置。

但是，格式字符串 scanf("%d %d" 没有说明任何有关逗号的内容，因此输入失败，并且 col 永远不会获取值。