games2.c

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

char board[3][3];
const char PLAYER = 'X';
const char COMPUTER = 'O';

void resetBoard();
void printBoard();
int checkFreeSpaces();
void playerMove();
void computerMove();
char checkWinner();
void printWinner(char winner);

void games2()
{
    char winner = ' ';
    char response = ' ';
    printf("*****************************************************\n");
    printf("*                                                   *\n");
    printf("*                                                   *\n");
    printf("*                Welcome to Tic Tac Toe             *\n");
    printf("*                       A.K.A XOX                   *\n");
    printf("*                                                   *\n");
    printf("*                                                   *\n");
    printf("*****************************************************\n");
    int round = 1;
    int scrplayer = 0, scrcomputer = 0;
    do
    {
        printf("*****************************************************\n");
        printf("*                  ROUND - %d                        *\n",round);
        printf("*                                                   *\n");
        printf("*              PLAYER-1 VS COMPUTER                 *\n");
        printf("*      Score:  %d           %d                        *\n",scrplayer, scrcomputer);
        printf("*                                                   *\n");
        printf("*                                                   *\n");
        printf("*                                                   *\n");
        printf("*****************************************************\n");

        winner = ' ';
        response = ' ';
        resetBoard();

        while(winner == ' ' && checkFreeSpaces() != 0)
        {
            printBoard();

            playerMove();
            winner = checkWinner();

            if(winner != ' ' || checkFreeSpaces() == 0)
            {
                scrplayer++;
                break;
            }

            computerMove();
            winner = checkWinner();

            if(winner != ' ' || checkFreeSpaces() == 0)
            {
                scrcomputer++;
                break;
            }
        }

        printBoard();
        printWinner(winner);

        printf("\nWould you like to play again? (Y/N): ");
        fflush(stdin);
        scanf("%c", &response);
        response = toupper(response);
        round++;
    } while (response == 'Y');

    printf("Thanks for playing!");
}

void resetBoard()
{
    int i, j;
    for(i = 0; i < 3; i++)
    {
        for(j = 0; j < 3; j++)
        {
            board[i][j] = ' ';
        }
    }
}
void printBoard()
{
    printf(" %c | %c | %c ", board[0][0], board[0][1], board[0][2]);
    printf("\n---|---|---\n");
    printf(" %c | %c | %c ", board[1][0], board[1][1], board[1][2]);
    printf("\n---|---|---\n");
    printf(" %c | %c | %c ", board[2][0], board[2][1], board[2][2]);
    printf("\n");
}
int checkFreeSpaces()
{
    int freeSpaces = 9;
    int i, j;
    for(i = 0; i < 3; i++)
    {
        for(j = 0; j < 3; j++)
        {
        	if(board[i][j] != ' ')
        	{
            	freeSpaces--;
        	}
      	}
   	}
   	return freeSpaces;
}
void playerMove()
{
   	int x;
   	int y;

   	do
   	{
      	printf("Enter row #(1-3): ");
      	scanf("%d", &x);
      	x--;
      	printf("Enter column #(1-3): ");
      	scanf("%d", &y);
      	y--;

      	if(board[x][y] != ' ')
      	{
        	printf("Invalid move!\n");
      	}
      	else
      	{
        	board[x][y] = PLAYER;
         	break;
      	}
   	} while (board[x][y] != ' ');

}
void computerMove()
{
   	//creates a seed based on current time
   	srand(time(0));
   	int x;
   	int y;

   	if(checkFreeSpaces() > 0)
   	{
      	do
      	{
         	x = rand() % 3;
         	y = rand() % 3;
      	} while (board[x][y] != ' ');

      	board[x][y] = COMPUTER;
   	}
   	else
   	{
      	printWinner(' ');
   	}
}
char checkWinner()
{
   	//check rows
   	int i;
   	for(i = 0; i < 3; i++)
   	{
      	if(board[i][0] == board[i][1] && board[i][0] == board[i][2])
      	{
        	return board[i][0];
      	}
   	}
   	//check columns
   	for(i = 0; i < 3; i++)
   	{
      	if(board[0][i] == board[1][i] && board[0][i] == board[2][i])
      	{
         	return board[0][i];
      	}
   	}
   	//check diagonals
   	if(board[0][0] == board[1][1] && board[0][0] == board[2][2])
   	{
      	return board[0][0];
   	}
   	if(board[0][2] == board[1][1] && board[0][2] == board[2][0])
   	{
      	return board[0][2];
   	}

   	return ' ';
}
void printWinner(char winner)
{
   	if(winner == PLAYER)
   	{
      	printf("YOU WIN!");
   	}
   	else if(winner == COMPUTER)
   	{
      	printf("YOU LOSE!");
   	}
   	else
	{
      	printf("IT'S A TIE!");
   	}
}