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;

        int shape = 0;

        int toppings = 0;

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

        while (shape < 1 || shape > 3)

        {

            Console.Write("Enter the shape of your pizza [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");

                    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)

        {

            while (toppings >= 4 || toppings <= 12)

            {

                Console.Write("Enter how many toppings :");

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

                if (toppings < 4 || toppings > 12)

                {

                    error = true;

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

                }

                else

                {

                    price = 27.85 * area + 15.75 * toppings;

                    break;

                }

            }

        }

​

        //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")

            {

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

                {

                    title = "Mr.";

                    break;

                }

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

                {

                    title = "Ms.";

                    break;

                }

                else

                {

                    error = true;

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

                    break;

                }

            }

​

            //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);

            }

        }

    }

}