Determine food and drink for two-hour party

// Determine food and drink for
// a 2-hour party.

#include <iostream>
#include <string>
#include <cmath> // ceil(), rounds up to the next integer

using namespace std;

int main()
{
    string num_guests_string; // Number of guests as string.
    float num_guests = 0; // Number of guests as decimal.
    float pizza = 0; // Number of pizzas needed.
    int whole_pizzas = 0; // Number of whole pizzas needed.
    float chips = 0; // Number of bags of chips needed.
    int bags_of_chips = 0; // Number of whole bags of chips needed.
    float beer_bottles = 0; // Number of bottles of beer needed.
    int beer_six_packs = 0; // Number of 6-packs of beer needed.
    float soda_cans = 0; // Number of cans of soda needed.
    int can_six_packs = 0; // Number of 6-packs of soda needed.

    cout << "This program will tell you how much \n"
    "food and drink to buy for your two-hour party,\n"
    "based on your number of guests.\n"
    "Pizza, chips, beerand soda.\n";

    cout << "\nHow many guests are you inviting? ";
    getline(cin, num_guests_string); // Get number of guests.
    num_guests = stof(num_guests_string); // Guests converted to decimal.

    pizza = num_guests / 4; // Pizza needed.
    whole_pizzas = ceil(pizza); // Whole pizza needed.
    chips = num_guests / 8; // Chips needed.
    bags_of_chips = ceil(chips); // Bags of chips needed.
    beer_bottles = num_guests * 2; // Bottles of beer needed.
    beer_six_packs = ceil(beer_bottles / 6); // Beer six-packs needed.
    soda_cans = num_guests * 3; // Cans of soda needed.
    can_six_packs = ceil(soda_cans / 6); // Can six-packs needed.

    // Announce result.
    cout << "\nFor " << num_guests << " guests, buy this amount of food and drink:\n\n";

    // Display the result.
    cout << "18\" pizzas: " << whole_pizzas << "\n"
        "large bags of chips: " << bags_of_chips << "\n"
        "beer six-packs: " << beer_six_packs << "\n"
        "soda six-packs: " << can_six_packs << "\n";

    return 0; // End the program.
}