编辑代码

using System;
 
namespace CircleCalculations
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("请输入圆的半径: ");
            double radius = double.Parse(Console.ReadLine());
 
            Circle circle = new Circle(radius);
            Console.WriteLine($"圆的面积是: {circle.Area}");
            Console.WriteLine($"圆的周长是: {circle.Perimeter}");
        }
    }
 
    class Circle
    {
        public double Radius { get; set; }
        public Circle(double radius)
        {
            Radius = radius;
        }
 
        public double Area
        {
            get { return Math.PI * Radius * Radius; }
        }
 
        public double Perimeter
        {
            get { return 2 * Math.PI * Radius; }
        }
    }
}