Java
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char[][] array = new char[size][size];
        char tic = 'x';
        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array.length; j++) {
                if (j == i || j == array.length - 1 - i)
                    array[i][j] = tic;
            }
        }for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array[i].length; j++) {
                System.out.print(array[i][j] + " ");
            }
            System.out.println();
        }