Tally even odd

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

// Take a list of numbers.
// Display a string indicating more even or
// more odd numbers.

// This function takes an integer and returns
// true if it is even. Otherwise, it returns false.
int is_even(int number)
{
    // If two divides into the number evenly
    if (number % 2 == 0)
    {
        // The number is even.
        return true;
    }
    else // Otherwise,
    {
        // The number is odd.
        return false;
    }
}

// This function takes a list of numbers and returns
// a string indicating more even or more odd numbers, or
// an equal amount of even and odd numbers.
string get_even_odd_balance(vector<int>& number_list)
{
    // The text stating more even or odd numbers.
    string balance;

    // These store the number of odd and even numbers.
    int number_of_even_numbers = 0;
    int number_of_odd_numbers = 0;

    // We are testing this number.
    int current_number;

    // Go from the beginning to the end of the number list.
    for (size_t i = 0; i < number_list.size(); ++i)
    {
        // Test the next number.
        current_number = number_list[i];

        // If the number is even,
        if (is_even(current_number))
        {
            // Add one to the number of even numbers.
            number_of_even_numbers++;
        }
        else
        {
            // Add one to the number of odd numbers
            number_of_odd_numbers++;
        }
    }

    // If there are more odd numbers than odd numbers,
    if (number_of_even_numbers < number_of_odd_numbers)
    {
        // DIsplay there are more odd numbers.
        balance = "There are more odd numbers.";
    }
    // Otherwise, if there are more odd numbers than odd numbers,
    else if (number_of_even_numbers > number_of_odd_numbers)
    {
        // Display there are more even numbers.
        balance = "There are more even numbers.";
    }
    // Otherwise, if there is an equal amount,
    else
    {
        // Display there is an equal amount.
        balance = "There is an equal number of even and odd numbers.";
    }

    return balance;
}

int main()
{
    // Create a list of numbers.
    vector<int> numbers = { 1, 2, 3, 12, 24, 14, 19, 30 };

    // Get a string stating more or less even numbers.
    string even_odd_balance = get_even_odd_balance(numbers);

    // Display the result.
    cout << even_odd_balance << endl;

    return 0;
}