Count words in text

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

int main()
{
    string text; // The text to be counted.
    int number_of_words = 0; // Total number of words.
    int last_space = 0; // Last space in the text.

    cout << "Enter your text:\n";
    getline(cin, text); // Get the text.
    // Check the text.
    for (int i = 0; i < text.size(); ++i)
    {
        if (text[i] == ' ') // If there is a space,
        {
            ++number_of_words; // Count it.
            last_space = i; // Note where the last space is.
        }
    }

    // If there is a word after the last space,
    if (last_space != (text.size() - 1))
    {
        number_of_words += 1; // Add one word.
    }

    cout << "This text has " << number_of_words << " words.\n";

    // End the program.
    return 0;
}