设计一个圆柱体类，计算表面积及体积。建立一个半径为3、高为3.5的圆柱体，输出其表面积及体积

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication10
{
    class Program
    {
        static void Main(string[] args)
        {
            double radius = 3;
            double high = 3.5;
            double superficial;
            double vol = volume(radius,high,out superficial);
            Console.WriteLine("表面积为:{0}，体积为{1}",superficial,vol);
            Console.ReadKey();
        }
        static double volume(double radius, double high,out double superficial )//计算面积与体积的方法
        {
            double area = 3.14 * radius * radius;//圆的面积公式S=πr²
            double lateral = 2 * 3.14 * radius * high;//圆柱体侧面积=底面圆周长×高=2×3.14×底面半径×高
            superficial = lateral + (area * 2);//侧面积+底面积乘以2
            double volume = area * high;//体积
            return volume;
        }
    }
}