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RE: C++ Tic Tac Toe

jeffreyz (10)
I am a bit confused as to why my program won't execute. It runs the code and immediately terminates. Also, for my void printboard function, is there a way to return the board?

#include <iostream>


using namespace std;

int main()
{
bool checkboard (int myarray[3][3], bool decider1);
bool winorlose(int myarray[3][3], bool decider2);
bool decider1;
bool decider2;
char person1 = 'X';
char person2 = 'O';
int x;
int y;
int a;
int b;
char myarray[3][3];

cout << "In real life, play Rock,paper or scissors to see who goes first." << endl;

while (decider1 = false)
{

cout << "Player one start." << endl;
cin >> a;
cin >> b;

while (a > 2 && a < 0 && b > 2 && b < 0)
{
cout << "Invalid move. Try again" << endl;
cin >> a;
cin >> b;
}

myarray[a][b] = person1;

cout << "Player two start." << endl;
cin >> x;
cin >> y;

while (x > 2 && x < 0 && y > 2 && y < 0)
{
cout << "Invalid move. Try again" << endl;
cin >> a;
cin >> b;
}

myarray[x][y] = person2;


}
return 0;

}


bool checkboard (int myarray[3][3],bool decider1)
{

decider1 = false;

for (int i=0;i<=2;i++)
{
for (int j=0;j<=2;j++)
{
while (myarray[i][j] == 1)
{
cout << "Invalid move." << endl;
decider1 = true;
}
}
}

return decider1;
}

bool winorlose(int myarray[3][3],bool decider2)
{
decider2 = false;

if (myarray[0][0] == 1 && myarray[0][1] == 1 && myarray[0][2] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[1][0] == 1 && myarray[1][1] == 1 && myarray[1][2] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[2][0] == 1 && myarray[2][1] == 1 && myarray[2][2] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[0][0] == 1 && myarray[2][0] == 1 && myarray[3][0] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[0][1] == 1 && myarray[1][1] == 1 && myarray[2][1] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[0][2] == 1 && myarray[1][2] == 1 && myarray[2][2] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[0][0] == 1 && myarray[1][1] == 1 && myarray[2][2] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else if (myarray[0][2] == 1 && myarray[1][1] == 1 && myarray[2][0] == 1)
{
cout << "Congratulations, you won!" << endl;
decider2 = true;
}

else
{
cout << "Wow, it's a draw!" << endl;
decider2 = true;
}


return decider2;

}


void PrintBoard (char myarray[3][3], char person1, char person2)
{

cout << "_" << myarray[1][1] << "_|_" << myarray[1][2] << "_|_" << myarray[1][3] << "_" << endl;
cout << "_" << myarray[2][1] << "_|_" << myarray[2][2] << "_|_" << myarray[2][3] << "_" << endl;
cout << " " << myarray[3][1] << " | " << myarray[3][2] << " | " << myarray[3][3] << endl;


}
closed account (jyU4izwU)
http://www.cppforschool.com/project/tic-tac-toe-project.html
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#include <iostream>
using namespace std;

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;

		cout << "Player " << player << ", enter a number:  ";
		cin >> 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
		{
			cout<<"Invalid move ";

			player--;
			cin.ignore();
			cin.get();
		}
		i=checkwin();

		player++;
	}while(i==-1);
	board();
	if(i==1)

		cout<<"==>\aPlayer "<<--player<<" win ";
	else
		cout<<"==>\aGame draw";

	cin.ignore();
	cin.get();
	return 0;
}

/*********************************************

	FUNCTION TO RETURN GAME STATUS
	1 FOR GAME IS OVER WITH RESULT
	-1 FOR GAME IS IN PROGRESS
	O GAME IS OVER AND NO RESULT
**********************************************/

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;
}


/*******************************************************************
     FUNCTION TO DRAW BOARD OF TIC TAC TOE WITH PLAYERS MARK
********************************************************************/


void board()
{
	system("cls");
	cout << "\n\n\tTic Tac Toe\n\n";

	cout << "Player 1 (X)  -  Player 2 (O)" << endl << endl;
	cout << endl;

	cout << "     |     |     " << endl;
	cout << "  " << square[1] << "  |  " << square[2] << "  |  " << square[3] << endl;

	cout << "_____|_____|_____" << endl;
	cout << "     |     |     " << endl;

	cout << "  " << square[4] << "  |  " << square[5] << "  |  " << square[6] << endl;

	cout << "_____|_____|_____" << endl;
	cout << "     |     |     " << endl;

	cout << "  " << square[7] << "  |  " << square[8] << "  |  " << square[9] << endl;

	cout << "     |     |     " << endl << endl;
}

/*******************************************************************
				END OF PROJECT
********************************************************************/
rodiongork (167)
I could not get rid of feeling these horrible "switches" should be substituted with something more handy.

For the first: making user move could be simply converted to:

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if (choice == u && square[u] == '0' + u)
	square[u] = mark;

Without all these 9 if-elses.

And now see here:

http://codeabbey.com/index/task_view/tic-tac-toe

Source of the small implementation inside this page could be seen:

For checking win condition the following code is used (sorry it is JavaScript but it could be rewritten to C++ straightforward):
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function checkWin(x, y) {
   var s = 0;
   for (var i = 0; i != 3; i++) { // checking rows
       s += field[y][i];
   }
   if (Math.abs(s) == 3) {
       return s;
   }
   s = 0;
   for (i = 0; i != 3; i++) { // checking columns
       s += field[i][x];
   }
   if (Math.abs(s) == 3) {
       return s;
   }
   if (x == y) { // checking one diagonal
       s = 0;
       for (i = 0; i != 3; i++) {
           s += field[i][i];
       }
       if (Math.abs(s) == 3) {
           return s;
       }
   }
   if (x + y == 2) { // checking second diagonal
       s = 0;
       for (i = 0; i != 3; i++) {
           s += field[2 - i][i];
       }
       if (Math.abs(s) == 3) {
           return s;
       }
   }
   return 0;
}


Though the code should be more laconic if the check of if (Math.abs(s) == 3) is moved to the end from 4 branches.
jeffreyz (10)
yes, both of your codes make sense, but i am unsure why my code does not run. for my printboard function, i tried putting printboard(...); in the main function, but the parameters i had didn't work, said something like i needed a bracket in it.
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