Display words in reverse order

#include <iostream>
#include <string>
#include <vector>
using namespace std;

// Take a sequence of words and
// display them in reverse order.
int main()
{
    string sequence_of_words; // User input.

    cout << "Enter any number of words:" << endl;
    getline(cin, sequence_of_words); // Get the words.

    int space_location = 0; // Location of a space.
    int start_position = 0; // Begin a new word.
    int length = 0; // Length of the word.
    string word; // A word.
    vector<string> separate_words;

    cout << "Here are your words in reverse order:" << endl;
    if (!sequence_of_words.empty()) // If the user entered words,
    {
        // While there is a space in the sentence,
        while ( (space_location = sequence_of_words.find(" ", start_position)) != string::npos)
        {
            // Get the length of the word.
            length = space_location - start_position;

            // Get the word.
            word = sequence_of_words.substr(start_position, length);

            // Add the word to the vector.
            separate_words.push_back(word);

            // This is the start of the next word.
            start_position = space_location + 1;
        }

        // If there are no more spaces,
        // Get the length of the last word.
        length = sequence_of_words.size() - start_position;

        // Get the last word.
        word = sequence_of_words.substr(start_position, length);

        // Add the word to the vector.
        separate_words.push_back(word);

        // Find out how many words there are.
        size_t list_size = separate_words.size();

        // Start at the end of the list.
        for (int x = 1; x <= list_size; ++x)
        {
            // Display the word.
            cout << separate_words[list_size - x] << " ";
        }

        // Go to the next line.
        cout << endl;
    }
    else // If the user did not enter anything,
    {
        cout << "No words were entered." << endl;
    }

    // End the program.
    return 0;
}