Language C -Tic Tac Toe

tictactoe.cpp

#define _CRT_SECURE_NO_WARNINGS

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

char square[10] = { 'o', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

int checkwin();
void board();

int main()
{
	int player = 1, i, choice;

	char mark;
	do
	{
		board();

		player = (player % 2) ? 1 : 2;

		printf("Player %d, enter a number: ", player);
		scanf(" %d", &choice);

		mark = (player == 1) ? 'X' : 'O';

		if (choice == 1 && square[1] == '1')
		{
			square[1] = mark;
		}
		else if (choice == 2 && square[2] == '2')
		{
			square[2] = mark;
		}
		else if (choice == 3 && square[3] == '3')
		{
			square[3] = mark;
		}
		else if (choice == 4 && square[4] == '4')
		{
			square[4] = mark;
		}
		else if (choice == 5 && square[5] == '5')
		{
			square[5] = mark;
		}
		else if (choice == 6 && square[6] == '6')
		{
			square[6] = mark;
		}
		else if (choice == 7 && square[7] == '7')
		{
			square[7] = mark;
		}
		else if (choice == 8 && square[8] == '8')
		{
			square[8] = mark;
		}
		else if (choice == 9 && square[9] == '9')
		{
			square[9] = mark;
		}
		else
		{
			printf("Invalid move");
			player--;
			fflush(stdin);
			getchar();
		}
		i = checkwin();
		player++;
	} while (i == -1);

	board();

	if (i == 1) { printf("==>\aPlayer %d win", --player); }
	else
	{
		printf("==>\aGame draw");
	}
	fflush(stdin);
	getchar();
	return 0;
}


int checkwin() {

	if (square[1] == square[2] && square[2] == square[3])
	{
		return 1;
	}
	else if (square[4] == square[5] && square[5] == square[6])
	{
		return 1;
	}
	else if (square[7] == square[8] && square[8] == square[9])
	{
		return 1;
	}
	else if (square[1] == square[4] && square[4] == square[7])
	{
		return 1;
	}
	else if (square[2] == square[5] && square[5] == square[8])
	{
		return 1;
	}
	else if (square[3] == square[6] && square[6] == square[9])
	{
		return 1;
	}
	else if (square[1] == square[5] && square[5] == square[9])
	{
		return 1;
	}
	else if (square[3] == square[5] && square[5] == square[7])
	{
		return 1;
	}

	else if (square[1] != '1' && square[2] != '2' && square[3] != '3' && square[4] != '4' && square[5] != '5' && square[6] != '6' && square[7] != '7' && square[8] != '8' && square[9] != '9')
	{
		return 0;
	}
	else
	{
		return -1;
	}
}

void board() {
	system("cls");

	printf("\n\n\tTic Tac Toe\n\n");
	printf("Player 1 (X) - Player 2 (O)\n\n\n");



	printf("      |      |       \n");
	printf("   %c  |   %c  |  %c \n", square[1], square[2], square[3]);

	printf("______|______|______\n");
	printf("      |      |      \n");

	printf("   %c  |   %c  |  %c \n", square[4], square[5], square[6]);

	printf("______|______|______\n");
	printf("      |      |      \n");

	printf("   %c  |   %c  |  %c \n", square[7], square[8], square[9]);

	printf("      |      |      \n\n");

}