	private void nextInts() {
		switch (operation) {
		case 0:
			operand1 = random.nextInt(99) + 1;
			operand2 = random.nextInt(99) + 1;
			result = operand1 + operand2;
			break;
		case 1:
			operand1 = random.nextInt(99) + 1;
			operand2 = random.nextInt(99) + 1;
			result = operand1 - operand2;
			break;
		case 2:
			operand1 = random.nextInt(8) + 2;
			operand2 = random.nextInt(8) + 2;
			result = operand1 * operand2;
			break;
		case 3:
			result = random.nextInt(8) + 2;
			operand2 = random.nextInt(8) + 2;
			operand1 = result * operand2;
			break;	
		default:
			throw new IllegalArgumentException("This should not happen");
		}
	}

	private void nextInts() {
		switch (operation) {
		case 0:
			operand1 = random.nextInt(99) + 1;
			operand2 = random.nextInt(99) + 1;
			result = operand1 + operand2;
			break;
		case 1:
			operand1 = random.nextInt(99) + 1;
			operand2 = random.nextInt(99) + 1;
			result = operand1 - operand2;
			break;
		case 2:
			operand1 = random.nextInt(8) + 2;
			operand2 = random.nextInt(8) + 2;
			result = operand1 * operand2;
			break;
		case 3:
			result = random.nextInt(8) + 2;
			operand2 = random.nextInt(8) + 2;
			operand1 = result / operand2;
			break;	
		default:
			throw new IllegalArgumentException("This should not happen");
		}
	}
