The program is compiling just fine but I keep receiving an output of:
Segmentation fault (code dumped)
The program is designed to play a simple game of tic tac toe with a human and computer that plays a random space. I'm curious as to what this message means and feel it has something to do with my pointers but I'm not sure how or where. Any help is very appreciated. Here's my code:
#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;
}
