Thread: non-lvalue error

/*****
Name:Zackery Breeland Date Assigned:April 7, 2009
Course:CSE 1233 Date Due:April 17, 2009

File Name: zlb12Lab8.c

Program Description:
To create a tick tack toe game against a computer.
*****/

Code:

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

void Board();
void Winner();
int selection(char, int);

int boxArray[3][3];
int box1, box2;
char square[3][3];
char winner;
int Player = 0;

int main()
{
	int x, y;
	int box1 = 0;
	int box2 = 0;
	int Player;
	int boxValue = 0;
	char square[box1][box2];
	
	Board();

/*Choose Square*/
	while(winner = ' ')
	{
		printf("%c", winner);

		if(Player == 1)
		{
			printf("X");
			printf("Choose a square position:  ");
			printf("Row:  ");
			scanf("%d", &box1);
			printf("Column:  ");
			scanf("%d", &box2);

		if(selection(square[3][3], Player) == 1)
			Player = 1;
		else
			Player = 2;
		}
		
		else
		{
			printf("O");
			printf("Choose a square position:  ");
			printf("Row:  ");
			scanf("%d", &box1);
			printf("Column:  ");
			scanf("%d", &box2);
			
		if(selection(square[3][3], Player) == 1)
			Player = 2;
		else
			Player = 1;
		}
	}


		Board();
		Winner();	

return 0;
}	

/*Selection*/
int selection(char square[box1][box2], int player)
{

	if(square[box1 - 1][box2 - 1] == '\0' && (player == 1 || player == 0))
	{
		square[box1 -1][box2 - 1] = 'x';
	return 0;
	}

	else if(square[box1 - 1][box2 - 1] == '\0' && player == 2)
	{
		square[box1 -1][box2 -1] == 'o';
	return 0;
	}

	else
		return 1;
}

/*Board*/
void Board()
{
	printf("   |   |   \n");
	printf("%c |%c |%c \n", square[0][0], square[0][1], square[0][2]);
	printf("   |   |   \n");
	printf("___________\n");
	printf("   |   |   \n");
	printf("%c |%c |%c \n", square[1][0], square[1][1], square[1][2]);
	printf("   |   |   \n");
	printf("___________\n");
	printf("   |   |   \n");
	printf("%c |%c |%c \n", square[2][0], square[2][1], square[2][2]);
	printf("   |   |   \n");
}

/*Who Won*/
void Winner()
{

	if (square[0][0] == 'x' && square[0][1] = 'x' && square[0][2] = 'x')
		winner = 'x';
	else if (square[1][0] == 'x' && square[1][1] == 'x' && square[1][2] == 'x')
		winner = 'x';
	else if (square[2][0] == 'x' && square[2][1] == 'x' && square[2][2] == 'x')
		winner = 'x';
	else if (square[0][0] == 'x' && square[1][0] == 'x' && square[2][0] == 'x')
		winner = 'x';
	else if (square[0][1] == 'x' && square[1][1] == 'x' && square[2][1] == 'x')
		winner = 'x';
	else if (square[0][2] == 'x' && square[1][2] == 'x' && square[2][2] == 'x')
		winner = 'x';
	else if (square[0][0] == 'x' && square[1][1] == 'x' && square[2][2] == 'x')
		winner = 'x';
	else if (square[0][2] == 'x' && square[1][1] == 'x' && square[2][0] == 'x')
		winner = 'x';
	else if (square[0][0] == 'o' && square[0][1] == 'o' && square[0][2] == 'o')
		winner = 'o';
	else if (square[1][0] == 'o' && square[1][1] == 'o' && square[1][2] == 'o')
		winner = 'o';
	else if (square[2][0] == 'o' && square[2][1] == 'o' && square[2][2] == 'o')
		winner = 'o';
	else if (square[0][0] == 'o' && square[1][0] == 'o' && square[2][0] == 'o')
		winner = 'o';
	else if (square[0][1] == 'o' && square[1][1] == 'o' && square[2][1] == 'o')
		winner = 'o';
	else if (square[0][2] == 'o' && square[1][2] == 'o' && square[2][2] == 'o')
		winner = 'o';
	else if (square[0][0] == 'o' && square[1][1] == 'o' && square[2][2] == 'o')
		winner = 'o';
	else if (square[0][2] == 'o' && square[1][1] == 'o' && square[2][0] == 'o')
		winner = 'o';
	else
		printf("CAT");

	if(winner == 'x')
	{
		printf("x wins");
	return;
	}

	if(winner == 'o')
	{
		printf("o wins");
	return;
	}
}

// After this point the program gives me a non-lvalue in assignment on line 118 in void Winner(). Does anyone know what is wrong. I just can't get this thing to work.