AcornPublishing_essential-csharp-7e/EssentialCSharp-8.0/src/Chapter04/Listing04.26.IfStatementWithCurlyBraces.cs
using System;

namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter04.Listing04_26
{
    public class Program
    {
        public static void Main()
        {
            double radius = -1;
            double area = 0;

            if (radius >= 0)
            {
                area = Math.PI * radius * radius;
            }
            System.Console.WriteLine(
                $"The area of the circle is: { area:0.00}");

        }
    }
}
