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

int main () {
    
	/////////////////////////
	// Constant declarations
	
	// Chow amounts
	const int five_can_oz = 2;
	const int five_dry_oz = 1;
	const int six_can_oz = 2;
	const int six_dry_oz = 2;
	const int seven_can_oz = 3;
	const int seven_dry_oz = 3;
	const int eight_can_oz = 3;
	const int eight_dry_oz = 5;

	// Number of feeding related
	const int days_in_week = 7;
	const int meals_per_day = 3;
	
	// Food related items
	const int ounces_per_can = 12;
	const int pounds_per_bag = 10;
	const int ounces_per_pound = 16;
	const float cost_per_can = 1.25;
	const float cost_per_bag = 5.4;
	
	// Tax rate
	const float tax_rate = .04;

	///////////////////////////
	// Variable declarations
	int five_week_olds = 0;
	int	six_week_olds = 0;
	int seven_week_olds = 0;
	int	eight_week_olds = 0;
	
	int ounces_dry_food = 0;
	int ounces_canned_food = 0;
	int cans_needed = 0;
	int bags_needed = 0;
	
	bool get_discount = false;
	float discount_rate = 0.0;
	float food_cost = 0;
	float food_cost_discounted = 0;
	float tax_cost = 0;
	float total_cost = 0;
	
	//////////////////////////
	// Explain the program
	cout << "Welcome to the puppy food purchasing program" << endl << endl;
	cout << "Please enter the following information:" << endl;

	// Input the number of puppies
	cout << "Number of five week old puppies: ";
	cin >> five_week_olds;
	cout << "Number of six week old puppies: ";
	cin >> six_week_olds;
	cout << "Number of seven week old puppies: ";
	cin >> seven_week_olds;
	cout << "Number of eight week old puppies: ";
	cin >> eight_week_olds;
	
	//////////////////////////
	// Calculate the number of ounces of food per meal
	ounces_canned_food = 
		(five_week_olds * five_can_oz) 
		+ (six_week_olds * six_can_oz)
		+ (seven_week_olds * seven_can_oz)
		+ (eight_week_olds * eight_can_oz);
	
	ounces_dry_food = 
		(five_week_olds * five_dry_oz) 
		+ (six_week_olds * six_dry_oz)
		+ (seven_week_olds * seven_dry_oz)
		+ (eight_week_olds * eight_dry_oz);
	
	// Since everything above is for one meal, work out what is needed
	// for the whole week
	ounces_canned_food = ounces_canned_food * meals_per_day * days_in_week;
	ounces_dry_food = ounces_dry_food * meals_per_day * days_in_week;
	
	//////////////////////////
	// Calculate the number of cans and bags of food needed
	cans_needed = ounces_canned_food / ounces_per_can;
	// Make sure we buy an extra can if it doesn't work out exactly
	if ((ounces_canned_food % ounces_per_can) != 0)
		cans_needed = cans_needed + 1;
	

	bags_needed = (ounces_dry_food/(ounces_per_pound * pounds_per_bag));
	// Make sure we buy an extra bag if it doesn't work out exactly	
	if ((ounces_dry_food % (ounces_per_pound * pounds_per_bag)) != 0)
		bags_needed = bags_needed + 1;
	
	//////////////////////////
	// Accounting
	 
	// Find out if we have a discount
	char input;
	cout << "Did you get a discount? (y/n): ";
	cin >> input;
	if ('y'== input||'Y'==input) {
		get_discount = true;
		cout << "Enter percent of discount (example: .1 = 10%): ";
		cin >> discount_rate;
	}
	
	// calclulate the totals
	food_cost = (cans_needed * cost_per_can) + (bags_needed * cost_per_bag);
	if (get_discount){
		food_cost_discounted = food_cost * (1 - discount_rate);
		tax_cost = food_cost_discounted * tax_rate;
		total_cost = food_cost_discounted + tax_cost;
	} 
	else {
		tax_cost = food_cost * tax_rate;
		total_cost = food_cost + tax_cost;
	}
	
	//////////////////////////
	// Output things neatly
	cout << endl << "This week we need:" << endl;
	cout << "Cans of food: " << cans_needed << endl;
	cout << "Bags of food: " << bags_needed << endl;
	cout << endl;
	//cout.setf(ios::fixed, ios::floatfield);
	cout << fixed;
	cout << setprecision(2) << "Cost of food: " << food_cost << endl;
	if (get_discount)
		cout << "Discounted cost of food: " << food_cost_discounted << endl;
	cout << "Tax amount: " << tax_cost << endl;
	cout << "Total cost: " << total_cost << endl;
		
	
    return 0;
}