using System;

​

public class Program

{

    public static void Main()

    {

        double area = 0.0;

        double price = 0.0;

        string title = "";

        string gender = "";

        string name = "";

        string pizzaShape = "";

        Boolean error = false;

        //The program will ask the user for the shape of the pizza (circle, square, triangle)

        Console.Write("Enter the shape of your pizza [1]Circle [2]Square [3]Triangle ");

        int shape = int.Parse(Console.ReadLine());

        while (shape > 3 || shape <= 0)

        {

            Console.WriteLine("Choose only among [1]Circle [2]Square [3]Triangle ");

            shape = int.Parse(Console.ReadLine());

        }

​

        //The program will then ask the user for the necessary dimension (radius for circle, side for square, base and height for triangle)

        //Display an error message when the user enter any string value other than "circle","square", and "triangle".

        switch (shape)

        {

            case 1:

                Console.Write("Enter radius: ");

                int radius = int.Parse(Console.ReadLine());

                area = Math.PI * Math.Pow(radius, 2);

                pizzaShape = "Circle";

                break;

            case 2:

                Console.Write("Enter side: ");

                int side = int.Parse(Console.ReadLine());

                area = side * side;

                pizzaShape = "Square";

                break;

            case 3:

                Console.Write("Enter base: ");

                int b = int.Parse(Console.ReadLine());

                Console.Write("Enter height: ");

                int h = int.Parse(Console.ReadLine());

                area = (b * h) / 2.0;

                pizzaShape = "Triangle";

                break;

            default:

                error = true;

                Console.WriteLine("Invalid Shape: Bye");

                break;

        }

​

        //The program will then ask the user for the number of toppings (min of 4 and max of 12)

        //Display an error message when the user enter a value that is not from 4 to 12.

        if (!error)

        {

            Console.Write("Enter toppings :");

            int toppings = int.Parse(Console.ReadLine());

            while (toppings < 4 || toppings > 12)

            {

                Console.WriteLine("Choose only from 4 to 12 toppings");

                toppings = int.Parse(Console.ReadLine());

            }

​

            if (toppings < 4 || toppings > 12)

            {

                error = true;

                Console.WriteLine("Invalid Number of Toppings: Bye");

            }

            else

            {

                price = 27.85 * area + 15.75 * toppings;

            }

        }

​

        //The program will then ask the user for his/her gender and name.

        //Display an error message when the user enter any string value other than "male" and "female"

        if (!error)

        {

            Console.Write("What is your name? ");

            name = Console.ReadLine();

            Console.Write("What is your gender? ");

            gender = Console.ReadLine();

            while (gender != "male" && gender != "female")

            {

                Console.WriteLine("Enter only male or female");

                gender = Console.ReadLine();

            }

​

            if (gender.ToLower().Equals("Male"))

            {

                title = "Mr.";

            }

            else if (gender.ToLower().Equals("Female"))

            {

                title = "Ms.";

            }

            else

            {

                error = true;

                Console.WriteLine("Gender Unknown: Bye");

            }

        }

​

        //The program will then display the price of the pizza [Assume that each square inches of pizza is 27.85 plus 15.75 per toppings]

        if (!error)

        {

            Console.WriteLine("\n\n======================================");

            Console.WriteLine("Name: " + name);

            Console.WriteLine("Pizza: " + pizzaShape);

            Console.WriteLine("Price: " + price);

            Console.WriteLine("\nThank you. Please come back {0} {1}", title, name);

        }

    }

}