using System;

​

public class Program

{

    /// <summary> 

    /// Get the Float Value From User 

    /// </summary>

    static float GetFloatValueFromUser(string promptMessage){

        Console.Write(promptMessage);

        float initAngle;

        bool isFloatConverted = float.TryParse(Console.ReadLine(), out initAngle);

        if(!isFloatConverted){

            Console.WriteLine("Invalid Initial Angle!");

            GetFloatValueFromUser(promptMessage);

        }

        return initAngle;

    }

    /// <summary> 

    /// Conversion Method from Degree to Radian 

    /// </summary>

    static double DegreeToRadian(float angle)

    {

        return Math.PI * angle / 180.00;

    }

    public static void Main()

    {

        Console.WriteLine("Welcome! ");

        Console.WriteLine("This application will calculate the maximum height of the shell and "+ 

                          "the distance. It will travel along the ground.");

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

        Console.WriteLine("Please provide following inputs: ");

        //Read Initial Angle from user

        float theta  = (float)DegreeToRadian(GetFloatValueFromUser("Initial Angle: ")); 

        //Read Speed from User

        float speed = GetFloatValueFromUser("Speed: ");

        float vox = speed * (float)Math.Cos(theta);

        float voy = speed * (float)Math.Sin(theta);

        const float g = 9.8f;

        double t = voy / g;

        double h = voy * voy / (2 * g);

        double dx = vox * 2 * t;

        Console.WriteLine("Height of shell at apex is {0} meters", h.ToString("n3"));

        Console.WriteLine("Distance shell travels horizontally is {0} meters (assuming launch and target elevations are equal)", dx.ToString("n3"));

    }

}