Here is a Python solution for the problem:

```python
def hailstone(n):
sequence = [n]
while n != 1:
if n % 2 == 0:
n = n // 2
else:
n = 3 * n + 1
sequence.append(n)
return sequence

n = int(input("Enter a positive integer: "))
sequence = hailstone(n)

print(" ".join(str(i) for i in sequence))
print("The length of the sequence is {}.".format(len(sequence)))
```

This program works as follows:

1. It defines a function `hailstone(n)` that generates the Hailstone sequence for a given positive integer `n`. The function starts by initializing a list `sequence` with `n` as its first element. Then, it enters a loop that continues until `n` becomes 1. In each iteration of the loop, it checks whether `n` is even or odd. If `n` is even, it divides `n` by 2; if `n` is odd, it multiplies `n` by 3 and adds 1. It then appends the new value of `n` to `sequence`.

2. It prompts the user to enter a positive integer and stores the input in `n`.

3. It calls `hailstone(n)` to generate the Hailstone sequence for `n` and stores the result in `sequence`.

4. It prints the elements of `sequence`, separated by spaces.

5. It prints the length of `sequence`.

Question

Here is a Python solution for the problem:

```python
def hailstone(n):
    sequence = [n]
    while n != 1:
        if n % 2 == 0:
            n = n // 2
        else:
            n = 3 * n + 1
        sequence.append(n)
    return sequence

n = int(input("Enter a positive integer: "))
sequence = hailstone(n)

print(" ".join(str(i) for i in sequence))
print("The length of the sequence is {}.".format(len(sequence)))
```

This program works as follows:

1. It defines a function `hailstone(n)` that generates the Hailstone sequence for a given positive integer `n`. The function starts by initializing a list `sequence` with `n` as its first element. Then, it enters a loop that continues until `n` becomes 1. In each iteration of the loop, it checks whether `n` is even or odd. If `n` is even, it divides `n` by 2; if `n` is odd, it multiplies `n` by 3 and adds 1. It then appends the new value of `n` to `sequence`.

2. It prompts the user to enter a positive integer and stores the input in `n`.

3. It calls `hailstone(n)` to generate the Hailstone sequence for `n` and stores the result in `sequence`.

4. It prints the elements of `sequence`, separated by spaces.

5. It prints the length of `sequence`.

Knowee AI · Accepted Answer