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

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace ConsoleApplication10
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             double radius = 3;
14             double high = 3.5;
15             double superficial;
16             double vol = volume(radius,high,out superficial);
17             Console.WriteLine("表面积为:{0}，体积为{1}",superficial,vol);
18             Console.ReadKey();
19         }
20         static double volume(double radius, double high,out double superficial )//计算面积与体积的方法
21         {
22             double area = 3.14 * radius * radius;//圆的面积公式S=πr²
23             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
24             superficial = lateral + (area * 2);//侧面积+底面积乘以2
25             double volume = area * high;//体积
26             return volume;
27         }
28     }
29 }