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:

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#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;
        }
}

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// 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.

Code:

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if (square[0][0] == 'x' && square[0][1] = 'x' && square[0][2] = 'x')

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You are doing assignment here, not comparing. Note the single equals sign instead of the double equals.