// determines which of two pizza sizes is the best buy. \
// demonstrates stepwise program design
// Walt Savitch
// 2/10/00

#include <iostream>
using namespace std;

// Returns the price per square inch of a pizza
double unitprice(int diameter, double price);


int main() {
    int diameter_small, diameter_large; // pizza dimensions 
    double price_small, price_large,    // pizza total price
	   unitprice_small, unitprice_large; // price per inch^2

    // subtask 1. - input
    cout << "Welcome to the Pizza Consumers Union.\n";
    cout << "Enter diameter of a small pizza (in inches): ";
    cin >> diameter_small;
    cout << "Enter the price of a small pizza: $";
    cin >> price_small;
    cout << "Enter diameter of a large pizza (in inches): ";
    cin >> diameter_large;
    cout << "Enter the price of a large pizza: $";
    cin >> price_large;

    // subtask 2. - compute unit price for small pizza
    unitprice_small = unitprice(diameter_small, price_small);
    // subtask 3. - compute unit price for large pizza
    unitprice_large = unitprice(diameter_large, price_large);

    // subtask 4. - determine which is the better buy
    if (unitprice_large < unitprice_small)
        cout << "The large one is the better buy.\n";
    else
        cout << "The small one is the better buy.\n";

    // subtask 5. output
    cout << "Small pizza:\n"
         << "Diameter = " << diameter_small << " inches\n"
         << "Price = $" << price_small
         << " Per square inch = $" << unitprice_small << endl
         << "Large pizza:\n"
         << "Diameter = " << diameter_large << " inches\n"
         << "Price = $" << price_large
         << " Per square inch = $" << unitprice_large << endl;

    cout << "Buon Appetito!\n";
}

// Returns the price per square inch of a pizza. 
// this is a stub!
double unitprice(int diameter, double price) {
    double result;
    cout << "Parameters: diameter=" << diameter << 
                      ", price=" << price << endl;
    cout << "Enter unitprice result: ";
    cin >> result;
    return (result);
}