Question

So I did an assignment for c# and I was wondering if there is a better way to get it done? here are my directions also my code is at the bottom.

In this assignment you're going to Prompt the user for a double for the radius of a circle. You will convert their input to a double and calculate the area based on Pi * radius * radius or Pi r squared. Use Double.TryParse to attempt the conversion from the String value in the readline to the out variable (double) that you'll use for the calculation.

You can find examples of Double.TryParse here: https://msdn.microsoft.com/en-us/library/994c0zb1(v=vs.110).aspx

Keep prompting them for a valid number until they enter one. Then calculate and display the area of their circle.

You will then ask them if they'd like to calculate another (y/n). If they type anything but n and y then keep asking them until they enter y or n. You can use a readline for this or I recommend a readkey.

Y will cause the program to run again, n will cause the program to end. Code for uppercase and lowercase y's and n's.

My Program:

using System;

namespace Assignment2
{
    class Program
    {
        static void Main(string[] args)
        {
            string input;
            double bob;

            Console.WriteLine("Please enter a radius:");
            input = Console.ReadLine();
            Double.TryParse(input, out bob);
            bob = 3.14 * (bob) * (bob);
            Console.WriteLine("You inputted: {0}", bob);
            Console.WriteLine("Would you like to enter another?(y/n): ");
            input = Console.ReadLine();
            char innput = char.Parse(input);
            if (innput == 'y' || innput == 'Y')
            {

                Main(args);

            }

            else if (innput == 'n' || innput == 'N')
            {
                Console.ReadKey();

            }
           


        }
    }
}

Answer 1

Program -

using System;

namespace CircleArea
{
class Program
{
static void Main(string[] args)
{
double radius, area;
string input;
Console.WriteLine("Enter Radius: ");
//instead of doing Double.TryParse you can directly use Convert.ToDouble which will directly covert string to double
radius = Convert.ToDouble( Console.ReadLine());
area = Math.PI * radius * radius;
Console.WriteLine("\nArea of circle: "+area);
Console.WriteLine("Would you like to enter another?(y/n): ");
input = Console.ReadLine();
char innput = char.Parse(input);
if (innput == 'y' || innput == 'Y')
{

Main(args);

}

else if (innput == 'n' || innput == 'N')
{
Console.ReadKey();

}

}
}
}