using System;

public class Program

{

        const int INITPACKAGE = 9; //Question 5

        #region Main

        static void Main(string[] args)

        {

            bool menu = true;

            while (menu)

            {

                Console.WriteLine("Press 1 to convert Celsius to Farenheit.");

                Console.WriteLine("Press 2 to calculate percentage of students in the class");

                Console.WriteLine("Press 3 for baking ratios");

                Console.WriteLine("Press 4 for gym rates");

                Console.WriteLine("Press 5 for package prices and discounts");

                Console.WriteLine("Press any other key to exit the program");

​

                string menuSelect = Console.ReadLine();

                switch (menuSelect)

                {

                    case "1":

                        Question1();

                        break;

                    case "2":

                        Question2();

                        break;

                    case "3":

                        Question3();

                        break;

                    case "4":

                        Question4();

                        break;

                    case "5":

                        Question5();

                        break;

                    default:

                        menu = false;

                        break;

                }

            }

        }

        #endregion

​

        #region Q1

        static void Question1()

        {

            double Farenheit, Celsius = 0;

​

            Console.WriteLine("Converting Celsius to Farenheit.");

            Console.WriteLine("Enter degrees in Celsius.");

            while (!double.TryParse(Console.ReadLine(), out Celsius))

            {

                Console.WriteLine("Invalid input.");

                Console.WriteLine("Enter degrees in Celsius");

            }

​

            Farenheit = 1.8 * Celsius + 32;

​

            Console.WriteLine("It is {0} degrees Farenheit.", Farenheit);

        }

        #endregion

​

        #region Q2

        static void Question2()

        {

            int maleStudents = 0, femaleStudents = 0, totalStudents;

            double percentMale, percentFemale;

​

            Console.WriteLine("Calculating the percentage \nof male and female students.");

            Console.WriteLine("Enter the number of male students.");

            while (!int.TryParse(Console.ReadLine(), out maleStudents))

            {

                Console.WriteLine("Invalid input.");

                Console.WriteLine("Enter the number of male students.");

            }

            Console.WriteLine("Enter the number of female students.");

            while (!int.TryParse(Console.ReadLine(), out femaleStudents))

            {

                Console.WriteLine("Invalid input.");

                Console.WriteLine("Enter the number of female students.");

            }

            totalStudents = maleStudents + femaleStudents;

            percentMale = (double)maleStudents / totalStudents * 100;

            percentFemale = (double)femaleStudents / totalStudents * 100;

​

            Console.WriteLine("There are {0} male students, {1} female students, {2} total students.", maleStudents, femaleStudents, totalStudents);

            Console.WriteLine("The class is {0}% male and {1}% female.", percentMale, percentFemale);

        }

        #endregion

​

        #region Q3

        static void Question3()

        {

            int Cookies = 0;

            double Butter, Flour, Sugar;

​

            Console.WriteLine("How many cookies do you want to bake?");

            while (!int.TryParse(Console.ReadLine(), out Cookies))

            {

                Console.WriteLine("Invalid input.");

                Console.WriteLine("How many cookies do you want to bake?");

            }

            Flour = (double)Cookies * 11 / 192;

            Sugar = (double)Cookies / 32;

            Butter = (double)Cookies / 48;

​

            Console.WriteLine("To bake {0} cookies, you need {1} cups of flour, {2} cups of butter and {3} cups of sugar.", Cookies, Flour, Butter, Sugar);

        }

        #endregion

​

        #region Q4

        static void Question4()

        {

            int visitsGym = 0, totalMoney;

​

            Console.WriteLine("How many times have you visited the gym?");

            while (!int.TryParse(Console.ReadLine(), out visitsGym))

            {

                Console.WriteLine("Invalid input.");

                Console.WriteLine("Enter the number of times you visited the gym");

            }

            if (visitsGym > 10)

            {

                totalMoney = 10 * 12 + ((visitsGym - 10) * 10);

            }

            else

            {

                totalMoney = visitsGym * 12;

            }

            Console.WriteLine("Total cost is {1}$ and you visited the gym {0} times.", visitsGym, totalMoney);

        }

        #endregion

​

        #region Q5

        static void Question5()

        {

            int unitsPackage = 0, discount;

            double totalCost, discountValue;

            totalCost = 0;

            discount = 0;

            discountValue = 0;

​

            Console.WriteLine("How many packages are you planning to buy?");

            while (!int.TryParse(Console.ReadLine(), out unitsPackage))

            {

                Console.WriteLine("Invalid input.");

                Console.WriteLine("Enter the amount of packages desired.");

            }

            if (unitsPackage < 10)

            {

                totalCost = (double)99 * unitsPackage;

                discount = 0;

            }

            else

            {

                if (unitsPackage < 20)

                {

                    discountValue = 99 * 0.2;

                    totalCost = (double)99 * INITPACKAGE + ((99 - discountValue) * (unitsPackage - INITPACKAGE));

                    discount = 20;

                }

                else

                {

                    if (20 <= unitsPackage)

                    {

                        discountValue = 99 * 0.3;

                        totalCost = (double)99 * INITPACKAGE + (79.2 * 9) + ((99 - discountValue) * (unitsPackage - 19));

                        discount = 30;

                    }

                }

            }

            Console.WriteLine("The discount applied is {0}%, the total cost after discount is {1}$.", discount, totalCost);

        }

        #endregion

    }