//Laragan, Julianne Gayle

//Tatco, Jethro

//CCP-1103-ITAC

//AREA OF VARIOUS GEOMETRICAL SHAPE

using System;

​

public class Program

{

    public static void Main()

    {

        //user

        string input;

        int option;

        //circle

        string Radius;

        int radius;

        //Rectangle

        string len;

        string wid;

        //Triangle

        string Base;

        string height;

​

        double a;

        double perimeter;

​

        Console.WriteLine("Area of Various Geometrical Shape");

        Console.WriteLine("Select an option\n[1] Area of Circle\n[2] Area of Rectangle\n[3] Area of Triangle");

        Console.Write("Enter your Option: ");

        input = Console.ReadLine();

​

        if (Int32.TryParse(input, out option) == true)

        {

            if (option <= 0)

            { 

                Console.WriteLine("INVALID NEGATIVE NUMBER.");

            }

            else

            {

                if (option == 1)

                {

                    Console.Write("Enter Your Radius: ");

                    Radius = Console.ReadLine();

​

                    if (Int32.TryParse(Radius, out radius) == true)

                    {

                        if (radius <= 0)

                            Console.WriteLine("NEGATIVE OR ZERO IS NOT VALID");

                        }

                        else

                        {

                            a = (radius * radius) * 3.1416;

                            Console.WriteLine("The Area Of the Circle is {0:3,0.0000}", a);

                        }

                    }

                    else

                    {

                        Console.WriteLine("INVALID RADIUS.");

                    }

                }

                else

                { 

                    if (option == 2)

                    }

                        Console.Write("Enter The Length of Rectangle: ");

                        len = Console.ReadLine();

                        if (Int32.TryParse(len, out length) == true)

                        {

                            if (len <= 0)

                            { 

                                Console.WriteLine("NEGATIVE OR ZERO IS NOT VALID");

                            }

                            else

                            {

                                Console.WriteLine("Enter The Width of Rectangle: ");

                                wid = Console.ReadLine();

                                if (Int32.TryParse(wid, out width) == true)

                                {

                                    if (width <= 0)

                                    {

                                        Console.WriteLine("NEGATIVE OR ZERO IS NOT VALID");

                                    }

                                    else

                                    { 

                                        perimeter = (length * 2) + (width * 2)

                                        Console.WriteLine("The Perimeter of Rectangle is {0:3,0.0000}", perimeter);

                                }

                                else

                                {

                                    Console.Write("INVALID NUMBER FOR WIDTH.");

                                }

                            }

                        }

                        else

                        }

                            Console.Write("INVALID NUMBER FOR LENGTH");

                        }

    }

                    else

                    {

                        if(input == 3) 

                    {

                        Console.Write("Enter Base : ");

                        Base = Convert.ToDouble(Console.ReadLine());

                        Console.Write("Enter Height 2 : ");

                        Height = Convert.ToDouble(Console.ReadLine());

                        perimeter = (a* b)/2;

                        Console.WriteLine("The Area of Triangle is {0:#,0.0000}", a);

                    }

                }

            }

        }

​

        else

{

    Console.WriteLine("Invalid Input.");

}

    }

}

​

​