Find longest word

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

// Take a list of words and return the longest word.
string get_longest_word(vector<string>& word_list)
{
    // This will store the longest word.
    string longest_word;

    // We are testing this word.
    string current_word;

    // Start with zero as the greatest length.
    int greatest_length = 0;

    // This is the length of the current word.
    int length = 0;

    // Go from the beginning to the end of the word list.
    for (size_t i = 0; i < word_list.size(); ++i)
    {
        // Get the next word.
        current_word = word_list[i];

        // Let the length of the next word.
        length = current_word.size();

        // If the length is the longest so far,
        if (length > greatest_length)
        {
            // Store the new greatest length.
            greatest_length = length;

            // Store the word with the greatest length.
            longest_word = current_word;
        }
    }

    return longest_word;
}

int main()
{
    // Create a list of words.
    vector<string> words = { "red", "blue", "yellow", "pink" };

    // Get the longest word.
    string longest = get_longest_word(words);

    // Display the longest word.
    cout << longest << endl;

    return 0;
}