Same number in box

[noaboa]

Hi, I am making a sudoku game and I have tried to make a function so the same number dosent go into the same box(3x3) But I have a problem, it dosent work and I dont know why. Here is my code (I am drawing it in another function) I am checking in every box one box is 3x3:

  const static int BOARD_SIZE = 9;

  int board[BOARD_SIZE][BOARD_SIZE];
  bool isValid() {
	std::cout << "Start\n";
	int i = 0;

	int j = 0;
	while (i < 82){
		i += 3;
		std::cout << i << "\n";
		for (int j = 0; j < 82; j += 3){
			std::cout << j << " ";
			if (board[0 + i][0 + j] != 0){
				if (board[0 + j][0 + j] == board[0+i][1+j] || board[0+i][0+j] == board[0+i][2+j] ||
					board[0 + j][0 + j] == board[1+i][0+j] || board[0+i][0+j] == board[1+i][1+j] || board[0+i][0+j] == board[1+i][2+j] ||
					board[0 + j][0 + j] == board[2+i][0+j] || board[0+i][0+j] == board[2+i][1+j] || board[0+i][0+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[0+i][1+j] != 0){
				if (board[0+i][1+j] == board[0+i][0+j] || board[0+i][1+j] == board[0+i][2+j] ||
					board[0+i][1+j] == board[1+i][0+j] || board[0+i][1+j] == board[1+i][1+j] || board[0+i][1+j] == board[1+i][2+j] ||
					board[0+i][1+j] == board[2+i][0+j] || board[0+i][1+j] == board[2+i][1+j] || board[0+i][1+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[0+i][2+j] != 0){
				if (board[0+i][2+j] == board[0+i][1+j] || board[0+i][2+j] == board[0+i][0+j] ||
					board[0+i][2+j] == board[1+i][0+j] || board[0+i][2+j] == board[1+i][1+j] || board[0+i][2+j] == board[1+i][2+j] ||
					board[0+i][2+j] == board[2+i][0+j] || board[0+i][2+j] == board[2+i][1+j] || board[0+i][2+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[1+i][0+j] != 0){
				if (board[1+i][0+j] == board[0+i][1+j] || board[1+i][0+j] == board[0+i][2+j] ||
					board[1+i][0+j] == board[0+i][0+j] || board[1+i][0+j] == board[1+i][1+j] || board[1+i][0+j] == board[1+i][2+j] ||
					board[1+i][0+j] == board[2+i][0+j] || board[1+i][0+j] == board[2+i][1+j] || board[1+i][0+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[1+i][1+j] != 0){
				if (board[1+i][1+j] == board[0+i][1+j] || board[1+i][1+j] == board[0+i][2+j] ||
					board[1+i][1+j] == board[1+i][0+j] || board[1+i][1+j] == board[0+i][0+j] || board[1+i][1+j] == board[1+i][2+j] ||
					board[1+i][1+j] == board[2+i][0+j] || board[1+i][1+j] == board[2+i][1+j] || board[1+i][1+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[1+i][2+j] != 0){
				if (board[1+i][2+j] == board[0+i][1+j] || board[1+i][2+j] == board[0+i][2+j] ||
					board[1+i][2+j] == board[1+i][0+j] || board[1+i][2+j] == board[1+i][1+j] || board[1+i][2+j] == board[0+i][0+j] ||
					board[1+i][2+j] == board[2+i][0+j] || board[1+i][2+j] == board[2+i][1+j] || board[1+i][2+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[2+i][0+j] != 0){
				if (board[2+i][0+j] == board[0+i][1+j] || board[2+i][0+j] == board[0+i][2+j] ||
					board[2+i][0+j] == board[1+i][0+j] || board[2+i][0+j] == board[1+i][1+j] || board[2+i][0+j] == board[1+i][2+j] ||
					board[2+i][0+j] == board[0+i][0+j] || board[2+i][0+j] == board[2+i][1+j] || board[2+i][0+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[2+i][1+j] != 0){
				if (board[2+i][1+j] == board[0+i][1+j] || board[2+i][1+j] == board[0+i][2+j] ||
					board[2+i][1+j] == board[1+i][0+j] || board[2+i][1+j] == board[1+i][1+j] || board[2+i][1+j] == board[1+i][2+j] ||
					board[2+i][1+j] == board[2+i][0+j] || board[2+i][1+j] == board[0+i][0+j] || board[2+i][1+j] == board[2+i][2+j])
					return true;
				break;
			}

			if (board[2+i][2+j] != 0){
				if (board[2+i][2+j] == board[0+i][1+j] || board[2+i][2+j] == board[0+i][2+j] ||
					board[2+i][2+j] == board[1+i][0+j] || board[2+i][2+j] == board[1+i][1+j] || board[2+i][2+j] == board[1+i][2+j] ||
					board[2+i][2+j] == board[2+i][0+j] || board[2+i][2+j] == board[2+i][1+j] || board[2+i][2+j] == board[0+i][0+j])
					return true;
				break;
			}
		}
	}

	return false;
}

void boardNumbers(){ //Add 22-32 numbers
	srand(time(NULL));
	int maxNumber = rand() % 10 + 22;
	for (int i = 0; i <= maxNumber; i++){
		int randX = rand() % 9;
		int randY = rand() % 9;
		int randNumber = rand() % 9 + 1;
		board[randX][randY] = randNumber;
		//check if same number on 2 lines
		while (checkLine()){
			int randNumber = rand() % 9 + 1;
			board[randX][randY] = randNumber; 
		}
		while (isValid()){
			int randNumber = rand() % 9 + 1;
			board[randX][randY] = randNumber;
		}
	}
}