Area of a circle, with default integer value

Question

static void Main( string [] args) { WriteLine( "What is the radius of your circle: " ); WriteLine( "The area of your circle is: " + circleArea(Double.Parse(ReadLine())).ToString()); ReadKey(); } static double circleArea( double radius = 5.00) { return Math.PI * (radius * radius); } So far the code I have is working and it is able to calculate the area of a circle; however, I need to have the main method pass an integer variable (radius) with an optional default value. I thought I had it by adding =5 to my second method, but that wasn't it. Any help would be appreciated.

Rajanikant Hawaldar · Answer

Hello Eric Kraus, Please check this code using System; namespace Calculator { class Program { static void Main( string [] args) { Console.WriteLine( "What is the radius of your circle: " ); double radius = 0; if (Double.TryParse(Console.ReadLine(), out radius)) { Console.WriteLine( "The area of your circle is: " + circleArea(radius)); } else { Console.WriteLine( "Invalid input" ); } Console.ReadKey(); } static double circleArea( double radius = 5.00) { return Math.PI * (radius * radius); } } }

Laxmidhar Sahoo · Answer

hi@ Hawaldar perhaps he pass the value with space .so First stored in a string variale and then trim it double radius = 0; String p = Console.ReadLine(); if (Double.TryParse(p.Trim(), out radius))

Eric Kraus · Answer

To provide more context I receive an error of: System.FormatException: 'Input string was not in a correct format.' on the line below. Ideally if there isn't an input entered the default would be 4. WriteLine( "The area of your circle is: " + circleArea(Double.Parse(ReadLine())).ToString());