def find_max_min(numbers):
    if not numbers:
        return None, None
    
    max_num = numbers[0]
    min_num = numbers[0]
    
    for num in numbers[1:]:
        if num > max_num:
            max_num = num
        if num < min_num:
            min_num = num
    
    return max_num, min_num

def reverse_list(items):
    reversed_items = []
    for i in range(len(items) - 1, -1, -1):
        reversed_items.append(items[i])
    return reversed_items

numbers = [3, 1, 4, 1, 5, 9, 2, 6]
max_val, min_val = find_max_min(numbers)
print(f"List: {numbers}")
print(f"Max: {max_val}, Min: {min_val}")
print(f"Reversed: {reverse_list(numbers)}")
print(f"Original list unchanged: {numbers}")